阅读说明：本技术 阳离子脂质 (Cationic lipids ) 是由 铃木裕太 高桥良典 于 2018-12-25 设计创作，主要内容包括：本发明提供了一种阳离子脂质,该阳离子脂质能够用于将核酸递送至细胞质。根据本发明的阳离子脂质是例如由式(1)代表的化合物或其药学上可接受的盐,其中L<Sub>1</Sub>和L<Sub>2</Sub>独立地代表具有3至10个碳原子的亚烷基基团；R<Sub>1</Sub>和R<Sub>2</Sub>独立地代表具有4至24个碳原子的烷基基团或具有4至24个碳原子的烯基基团；R<Sub>3</Sub>代表具有1至3个碳原子的烷基基团；以及X<Sub>1</Sub>代表单键或CO-O-。<Image he="463" wi="700" file="DDA0002515849980000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>(The present invention provides a cationic lipid which can be used for delivering a nucleic acid to cytoplasm according to the present invention is, for example, a compound represented by formula (1) or a pharmaceutically acceptable salt thereof, wherein L 1 And L 2 Independently represents an alkylene group having 3 to 10 carbon atoms; r 1 And R 2 Independently represents an alkyl group having 4 to 24 carbon atoms or an alkenyl group having 4 to 24 carbon atoms; r 3 Represents an alkyl group having 1 to 3 carbon atoms; and X 1 Represents a single bond or CO-O-.)

1. A compound represented by formula (1), or a pharmaceutically acceptable salt thereof:

l therein₁And L₂Independently represents an alkylene group having 3 to 10 carbon atoms; r₁And R₂Independently represents an alkyl group having 4 to 24 carbon atoms or an alkenyl group having 4 to 24 carbon atoms; r₃Represents an alkyl group having 1 to 3 carbon atoms; and X₁Represents a single bond or CO-O-.

2. The compound according to claim 1, selected from the group consisting of: compounds represented by the following formulae (a1) to (a9), or pharmaceutically acceptable salts thereof.

3. The compound according to claim 1 or 2, which is represented by the following formula (a1), or a pharmaceutically acceptable salt thereof.

4. The compound according to claim 1 or 2, which is represented by the following formula (a2), or a pharmaceutically acceptable salt thereof.

5. The compound according to claim 1 or 2, which is represented by the following formula (a3), or a pharmaceutically acceptable salt thereof.

6. The compound according to claim 1 or 2, which is represented by the following formula (a4), or a pharmaceutically acceptable salt thereof.

7. The compound according to claim 1 or 2, which is represented by the following formula (a5), or a pharmaceutically acceptable salt thereof.

8. The compound according to claim 1 or 2, which is represented by the following formula (a6), or a pharmaceutically acceptable salt thereof.

9. The compound according to claim 1 or 2, which is represented by the following formula (a7), or a pharmaceutically acceptable salt thereof.

10. The compound according to claim 1 or 2, which is represented by the following formula (A8), or a pharmaceutically acceptable salt thereof.

11. The compound according to claim 1 or 2, which is represented by the following formula (a9), or a pharmaceutically acceptable salt thereof.

12. A lipid complex, the lipid complex comprising:

(I) a compound according to any one of claims 1 to 11, or a pharmaceutically acceptable salt thereof; and

(II) at least one lipid selected from the group consisting of neutral lipids, polyethylene glycol modified lipids and sterols.

13. A composition, comprising:

(I) a compound according to any one of claims 1 to 11, or a pharmaceutically acceptable salt thereof;

(II) at least one lipid selected from the group consisting of neutral lipids, polyethylene glycol modified lipids and sterols; and

(III) a nucleic acid.

14. A method for producing a composition, the method comprising:

a step of mixing an aqueous solution containing a polar organic solvent containing (I) the compound according to any one of claims 1 to 11 or a pharmaceutically acceptable salt thereof and (II) at least one lipid selected from the group consisting of a neutral lipid, a polyethylene glycol-modified lipid, and a sterol with an aqueous solution containing (III) a nucleic acid to obtain a mixed solution; and

a step of reducing the content percentage of the polar organic solvent in the mixed solution.

Technical Field

The present invention relates to novel cationic lipids.

Background

Nucleic acid (e.g., siRNA (small interfering RNA), miRNA (microrna), and shRNA (short hairpin RNA or small hairpin RNA)) expression vectors and antisense oligonucleotides induce sequence-specific gene silencing in vivo and are referred to as oligonucleotide therapeutics.

Among oligonucleotide therapeutics, siRNA has attracted particular attention. siRNA is double-stranded RNA consisting of 19 to 23 base pairs and induces sequence-specific gene silencing, known as RNA interference (RNAi).

The siRNA has chemical stability; however, siRNA has a problem in therapeutic applications (for example, easy decomposition by rnases (ribonucleases) in plasma, and difficult passage through cell membranes alone) (for example, see patent document 1).

To solve the above-described problems, it is known that by encapsulating siRNA in a fine particle containing a cationic lipid, the encapsulated siRNA is prevented from being decomposed in plasma and can permeate a lipophilic cell membrane (for example, see patent document 1).

Patent documents 2 to 6 disclose cationic lipids which are used for delivery of oligonucleotide therapeutic agents such as siRNA and have improved biodegradability.

Fine particles containing a cationic lipid have a stability problem that the particles may aggregate during storage, and a method of preventing aggregation by adding a polyethylene glycol-modified lipid (PEG lipid) to the fine particles is known. In addition, patent document 7 discloses a method of preventing agglutination of nucleic acids and improving delivery efficiency of nucleic acids by configuring fine particles containing a specific PEG lipid (i.e., PEG-DPG) and a preparation containing these fine particles and a deionized solvent.

List of citations

Patent document

Patent document 1: WO 2010/144740

Patent document 2: WO 2011/153493

Patent document 3: WO 2013/086354

Patent document 4: WO 2013/158579

Patent document 5: WO 2015/095346

Patent document 6: WO 2016/104580

Patent document 7: WO 2014/089239

Disclosure of Invention

However, despite recent developments, there is still a need for cationic lipids that can be used to deliver nucleic acids to the cytoplasm.

The present invention relates to [1] to [14] shown below.

[1] A compound represented by the following formula (1) or a pharmaceutically acceptable salt thereof:

l therein₁And L₂Independently represents an alkylene group having 3 to 10 carbon atoms; r₁And R₂Independently represents an alkyl group having 4 to 24 carbon atoms or an alkenyl group having 4 to 24 carbon atoms; r₃Represents an alkyl group having 1 to 3 carbon atoms; and X₁Represents a single bond or CO-O-.

[2] The compound according to [1], which is selected from the group consisting of: compounds represented by the following formulae (a1) to (a9), or pharmaceutically acceptable salts thereof.

[2a] The compound according to [2], which is selected from the group consisting of: a compound represented by the above formulae (a1), (a2), (A3), (a4), (a5), (a6), (A8), and (a9), or a pharmaceutically acceptable salt thereof.

[2b] The compound according to [2], which is selected from the group consisting of: a compound represented by the above formulae (a1), (a2), (A3), (a4), (a5), (a6), and (a9), or a pharmaceutically acceptable salt thereof.

[2c] The compound according to [2], which is selected from the group consisting of: a compound represented by the above formulae (a1), (a2), (a4) and (a6), or a pharmaceutically acceptable salt thereof.

[2d] The compound according to [1], which is represented by the following formula (2) or (3), or a pharmaceutically acceptable salt thereof:

l therein₁And L₂、R₁To R₃And X₁Is as defined in formula (1) above.

[2e]According to [1]Or [2d ]]The compound or a pharmaceutically acceptable salt thereof, wherein R₃Is a methyl group.

[3] The compound according to [1] or [2], which is represented by the following formula (A1), or a pharmaceutically acceptable salt thereof.

[4] The compound according to [1] or [2], which is represented by the following formula (A2), or a pharmaceutically acceptable salt thereof.

[5] The compound according to [1] or [2], which is represented by the following formula (A3), or a pharmaceutically acceptable salt thereof.

[6] The compound according to [1] or [2], which is represented by the following formula (A4), or a pharmaceutically acceptable salt thereof.

[7] The compound according to [1] or [2], which is represented by the following formula (A5), or a pharmaceutically acceptable salt thereof.

[8] The compound according to [1] or [2], which is represented by the following formula (A6), or a pharmaceutically acceptable salt thereof.

[9] The compound according to [1] or [2], which is represented by the following formula (A7), or a pharmaceutically acceptable salt thereof.

[10] The compound according to [1] or [2], which is represented by the following formula (A8), or a pharmaceutically acceptable salt thereof.

[11] The compound according to [1] or [2], which is represented by the following formula (A9), or a pharmaceutically acceptable salt thereof.

[12] A lipid complex comprising: (I) a compound according to any one of [1] to [11] and [2a ] to [2e ], or a pharmaceutically acceptable salt thereof; and (II) at least one lipid selected from the group consisting of neutral lipids, polyethylene glycol modified lipids and sterols.

[13] A composition comprising: (I) a compound according to any one of [1] to [11] and [2a ] to [2e ], or a pharmaceutically acceptable salt thereof; (II) at least one lipid selected from the group consisting of neutral lipids, polyethylene glycol modified lipids and sterols; and (III) a nucleic acid.

[14] A method for producing a composition, the method comprising: a step of mixing an aqueous solution containing a polar organic solvent containing (I) a compound according to any one of [1] to [11] and [2a ] to [2e ] or a pharmaceutically acceptable salt thereof and (II) at least one lipid selected from the group consisting of a neutral lipid, a polyethylene glycol-modified lipid, and a sterol with an aqueous solution containing (III) a nucleic acid to obtain a mixed solution; and a step of reducing the percentage of the content of the polar organic solvent in the mixed solution.

Effects of the invention

The cationic lipid of the present invention has one or more effects shown below:

(1) the cationic lipids of the present invention allow for efficient release of nucleic acids into the cytoplasm;

(2) the cationic lipid of the present invention can prevent the particle size of the lipid complex from increasing during storage over a certain period of time.

Thus, the cationic lipids of the present invention may be used as lipids for delivering nucleic acids into the cytoplasm.

Drawings

Fig. 1 is a graph showing the results of test example 1.

Fig. 2 is a graph showing the results of test example 2.

Detailed Description

The present invention is illustrated in detail below by showing examples and examples. However, the present invention is not limited to the embodiments and examples described below, and any modification may be made within a scope not departing from the concept of the present invention. All documents and publications cited in this specification are herein fully incorporated by reference, regardless of their purpose.

< cationic lipid >

In one embodiment, the present invention is a compound represented by the following formula (1) or a pharmaceutically acceptable salt thereof, and can be used as a cationic lipid. The cationic lipid may be a hydrate of the salt or a solvate of the salt.

In formula (1), L₁And L₂Independently represents an alkylene group having 3 to 10 carbon atoms; r₁And R₂Independently represents an alkyl group having 4 to 24 carbon atoms or an alkenyl group having 4 to 24 carbon atoms; r₃Represents an alkyl group having 1 to 3 carbon atoms; and X₁Represents a single bond or CO-O-.

As used herein, "alkyl" means a straight, cyclic, or branched chain saturated aliphatic hydrocarbon group having the indicated number of carbon atoms.

As used herein, "alkenyl" means a straight or branched hydrocarbon group having the indicated number of carbon atoms and at least one carbon-carbon double bond. Examples thereof include monoenes, dienes, trienes, and tetraenes; however, the term is not limited thereto.

As used herein, "alkylene" means a straight, cyclic, or branched divalent saturated aliphatic hydrocarbon group having the indicated number of carbon atoms.

As used herein, "halogen" means F, Cl, Br, or I.

The asymmetric atoms (e.g., carbon) in the compounds of the present invention can exist as concentrated racemic compounds or as enantiomers (e.g., in the (R) -, (S) -or (R, S) -configurations.

One embodiment of the present invention is a compound represented by the following formula (2) or (3), or a pharmaceutically acceptable salt thereof.

In the formula (2) or (3), L₁And L₂、R₁To R₃And X₁Is as defined in formula (1) above. The compounds according to the present embodiment may be used as cationic lipids. The cationic lipid may be a hydrate of the salt or a solvate of the salt.

One embodiment of the present invention is a compound having the above formulas (1) to (3), wherein L₁And L₂Independently represent an alkylene group having 3 to 10 carbon atoms (e.g., 3 to 8 carbon atoms); r₁And R₂Independently represents an alkyl group having 4 to 24 carbon atoms or an alkenyl group having 4 to 24 carbon atoms; r₃Represents an alkyl group having 1 to 3 carbon atoms; and X₁Represents a single bond or-CO-O-; or a pharmaceutically acceptable salt thereof, and can be used as a cationic lipid. The cationic lipid may be a hydrate of the salt or a solvate of the salt.

One embodiment of the present invention is a compound having the above formulas (1) to (3), wherein L₁And L₂Independently represent a linear alkylene group having 3 to 10 carbon atoms (e.g., 3 to 8 carbon atoms); r₁And R₂Independently represents a linear or branched alkyl group having 4 to 24 carbon atoms or a linear alkenyl group having 4 to 24 carbon atoms; r₃Is an alkyl group having 1 to 3 carbon atoms; and X₁is-CO-O-; or a pharmaceutically acceptable salt thereof, and can be used as a cationic lipid. The cationic lipid can be saline waterSolvates of the compounds or salts.

A specific embodiment of the present invention is a compound represented by the following formula (1a), or a pharmaceutically acceptable salt thereof.

In the formula (1a), R₁And R₂Independently an alkyl group having 4 to 24 carbon atoms or an alkenyl group having 4 to 24 carbon atoms; r₃Is an alkyl group having 1 to 3 carbon atoms; and n1 and n2 independently represent an integer of 3 to 10 (e.g., 3 to 8).

In one embodiment of the present invention, the present invention is a compound having the above formulas (1) to (3) (wherein, X₁is-CO-O-L₁And L₂The same; and R is₁And R₂Same); or a pharmaceutically acceptable salt thereof, and can be used as a cationic lipid. The cationic lipid may be a hydrate of the salt or a solvate of the salt.

In one embodiment of the present invention, the present invention is a compound having the above formula (1) to (3), wherein L₁And L₂Independently a linear alkylene group having 3 to 10 carbon atoms (e.g., 3 to 8 carbon atoms); r₁Is a linear or branched alkyl group having 4 to 24 carbon atoms or a linear alkenyl group having 4 to 24 carbon atoms; r₂Is a straight chain alkyl group having from 4 to 24 carbon atoms; r₃Is an alkyl group having 1 to 3 carbon atoms; and X₁Is a single bond, or a pharmaceutically acceptable salt thereof, in this example, L₂And R₂The total number of carbon atoms in (1) is preferably 9 to 12. The compounds of the present example can be used as cationic lipids. The cationic lipid may be a hydrate of the salt or a solvate of the salt.

A specific embodiment of the present invention is a compound represented by the following formula (1b), or a pharmaceutically acceptable salt thereof.

In the formula (1b), R₁Is an alkyl group having 4 to 24 carbon atoms or an alkenyl group having 4 to 24 carbon atoms; r₃Is an alkyl group having 1 to 3 carbon atoms; n1 represents an integer of 3 to 10 (e.g. 3 to 8); and n2 represents an integer of 6 to 33, preferably 8 to 11.

Examples of compounds according to embodiments of the invention are indicated below.

One embodiment of the present invention is a compound represented by any one of the above formulae (a1), (a2), (A3), (a4), (a5), (a6), (A8), and (a9), or a pharmaceutically acceptable salt thereof, and can be used as a cationic lipid. The cationic lipid may be a hydrate of the salt or a solvate of the salt.

One embodiment of the present invention is a compound represented by any one of the above formulae (a1), (a2), (A3), (a4), (a5), (a6), and (a9), or a pharmaceutically acceptable salt thereof, and can be used as a cationic lipid. The cationic lipid may be a hydrate of the salt or a solvate of the salt.

One embodiment of the present invention is a compound represented by any one of the above formulae (a1), (a2), (a4), and (a6), or a pharmaceutically acceptable salt thereof, and can be used as a cationic lipid. The cationic lipid may be a hydrate of the salt or a solvate of the salt.

As used herein, a "cationic lipid" is an amphiphilic molecule having lipophilic regions containing one or more hydrocarbon groups, and hydrophilic regions containing polar groups that are neutral or undergo protonation at physiological pH. That is, the cationic lipids of the present invention can be protonated to form cations. For example, the compound represented by the above formula (1) encompasses a compound represented by the following formula (1)' (cationic compound) in which a hydrogen ion is coordinated to a lone electron pair on a nitrogen atom on a pyrrolidine ring. The cationic compound may form a salt represented by the following formula (1)' and a hydrate or solvate of the salt with an anion.

In the formula (1)', L₁And L₂、R₁To R₃And X₁Is as defined in formula (1) above. Z is an anion (counterion). The compounds of the present example can be used as cationic lipids.

The anion (Z in the above formula (1)' which can be contained in the cationic lipid of the present embodiment by forming a pair with a cationic compound is not particularly limited as long as the anion is pharmaceutically acceptable. Examples thereof include inorganic ions such as chloride ion, bromide ion, nitrate ion, sulfate ion, and phosphate ion; organic acid ions such as acetate ion, oxalate ion, maleate ion, fumarate ion, citrate ion, benzoate ion, methanesulfonate ion and the like.

The cationic lipids of the present invention may have stereoisomers, such as geometric and optical isomers or tautomers. The cationic lipids of the present invention encompass all possible isomers, including the above-mentioned substances and mixtures thereof.

< method for producing cationic lipid >

The process for producing the cationic lipid of the present invention will now be described. One example of a synthetic scheme for cationic lipids is shown below. All compounds described herein are encompassed by the present invention as compounds. The compounds of the present invention can be synthesized according to at least one of the methods shown in the schemes shown below. The cationic lipids of the present invention may have one or more asymmetric centers, and thus the synthesized compounds may be produced as (R) -or (S) -stereoisomers or mixtures thereof (R, S). Unless otherwise indicated, recitation of a particular compound herein is intended to encompass individual enantiomers and racemic mixtures thereof. Methods for the determination of stereochemistry and the separation of stereoisomers are well known to those skilled in the art.

In the formula, L₁And R₁Are each as defined in the above formula (1), X and Y are each a halogen atom, and R in the formula (1) is-L₂-X₁-R₂--(L₂、X₁And R₂Respectively as defined in formula (1) above).

Cationic lipids having formula (1) (wherein X₁A compound that is a single bond) can be synthesized, for example, according to scheme 1 above.

(step 1-1: esterification)

First, an alcohol (a1) and a halogenated carboxylic acid X-L are reacted in the presence of a condensing agent₁-COOH (X is a halogen atom and L₁Is as defined above) (preferably a bromo carboxylic acid) to obtain the halo ester (a 2). Examples of the condensing agent include 1- [3- (dimethylamino) propyl group]-3-Ethylcarbodiimide (EDC) hydrochloride, N' -Dicyclohexylcarbodiimide (DCC) and the like. Optionally, a base may be added. Examples of bases include N-methylmorpholine (NMM), Triethylamine (TEA), N-Diisopropylethylamine (DIPEA), 4- (dimethylamino) pyridine (DMAP), pyridine, picoline, lutidine, and the like. Examples of the solvent include Tetrahydrofuran (THF), dichloromethane, chloroform, toluene, hexane, ethyl acetate, and the like.

Alternatively, the halogenated carboxylic acid X-L can be reacted, optionally in the presence of dimethylformamide₁-COOH (X is a halogen atom and L₁Is as defined above) (preferably a bromo carboxylic acid) with an electrophilic halogenating agent (such as oxalyl chloride) to convert to a carboxylic acid chloride, and reacting the carboxylic acid chloride further with an alcohol to obtain the halo-ester (a 2). Examples of the solvent include tetrahydrofuran, dichloromethane, chloroform, toluene, hexane and the like.

(Steps 1-2: introduction of alkyl chain)

The halogenated ester (a2) was then reacted with di-tert-butyl malonate in the presence of a base. By this reaction, the hydrogen atom of the active methylene group in the malonic acid diester is extracted to introduce an alkyl ester chain, thereby obtaining compound (a 3). Examples of bases include sodium hydride (NaH). Examples of the solvent include dioxane, tetrahydrofuran, cyclopentyl methyl ether, 1, 2-dimethoxyethane, DMF, N-methylpyrrolidone, and the like.

(Steps 1-3: introduction of alkyl chain)

Then, compound (a3) is reacted with an alkyl halide (R-Y) (preferably an alkyl iodide) in the presence of a base to introduce an alkyl chain, thereby obtaining compound (a 4). Bases and solvents similar to those of steps 1-2 above may be used.

(Steps 1-4: deprotection)

Then, the tert-butyl group (tBu) of compound (a4) was deprotected under acid hydrolysis conditions to obtain compound (a 5). Examples of acids used for deprotection include trifluoroacetic acid (TFA), hydrochloric acid, and the like. Examples of the solvent include dichloromethane and the like.

(Steps 1-5: decarboxylation)

Then, the monocarboxylic acid (a6) is obtained by decarboxylating the compound (a 5). The decarboxylation reaction can be carried out by, for example, heating in a solvent. Examples of the solvent include aromatic hydrocarbons such as toluene and xylene.

(Steps 1-6: reduction)

Reducing the carboxyl group of the compound (a6) to a hydroxyl group in the presence of a reducing agent to obtain a compound (a 7). Examples of reducing agents include borane complexes, such as Borane (BH)₃) Tetrahydrofuran complex and borane-dimethylsulfide complex. Examples of the solvent include ethers such as diethyl ether, tetrahydrofuran, and dioxane; halogenated hydrocarbons such as chloroform, dichloromethane and dichloroethane; hydrocarbons such as hexane and toluene; and mixed solvents thereof.

(Steps 1-7: esterification)

The obtained alcohol (a7) is reacted with 1-methyl-pyrrolidine-3-carboxylic acid or a derivative thereof (hydrogen halide or the like) in the presence of a condensing agent and a base to obtain a final product compound (a8) (R ═ L)₂-X₁-R₂) (corresponding to the cationic lipid of formula (1)). Condensing agents and bases similar to those of step 1-1 may be used.

When synthesizing X therein₁When the compound is-CO-O-, the compound whose carboxyl group is protected according to the following step 2-1 can be prepared in the above step 1-3 of scheme 1A compound (halogenated ester) which can react with the compound (a3), the obtained compound can be further subjected to steps 1-4 to 1-7, and deprotection and esterification of the carboxyl group (with R) can be finally carried out₂-reaction of OH).

In the formula, L₁And R₁Are each as defined in the above formula (1), X and Y are each a halogen atom, and R in the formula (1) is-L₂-X₁-R₂--(L₂、X₁And R₂Respectively as defined in formula (1) above).

Scheme 2 above illustrates the use by those skilled in the art for the synthesis of cationic lipids having formula (1) (wherein X₁A single bond compound).

(step 2-1: esterification)

First, benzyl alcohol and halogenated carboxylic acid X-L₁-COOH (X is a halogen atom and L₁As defined above) to obtain a halogenated ester (b 1). The esterification conditions were similar to those of step 1-1.

(step 2-2: introduction of alkyl chain)

Then, similarly to step 1-2, the halogenated ester (b1) is reacted with di-tert-butyl malonate in the presence of a base to obtain compound (b 2).

(Steps 2-3: introduction of alkyl chain)

Then, in analogy to steps 1-3, compound (b2) is reacted with an alkyl halide (R-Y) in the presence of a base to obtain compound (b 3).

(Steps 2-4: deprotection)

Then, similarly to steps 1 to 4, the tert-butyl group (tBu) of compound (b3) was deprotected under acid hydrolysis conditions to obtain compound (b 4).

(Steps 2-5: decarboxylation)

Then, in analogy to steps 1-5, the monocarboxylic acid (b5) was obtained.

(Steps 2-6: reduction step)

Further, similarly to steps 1 to 6, the monocarboxylic acid (b5) is reduced in the presence of a reducing agent to obtain the compound (b 6).

(Steps 2-7: esterification)

The obtained compound (b6) and 1-methyl-pyrrolidine-3-carboxylic acid or its derivative (hydrogen halide or the like) are subjected to an esterification reaction in the presence of a condensing agent and a base to obtain a compound (b 7). Condensing agents and bases similar to those of step 1-1 may be used.

(Steps 2-8: deprotection)

Then, the benzyl protecting group is deprotected under reducing conditions to obtain compound (b 8). Deprotection can be carried out, for example, by catalytic hydrogenation in the presence of a metal catalyst such as palladium on carbon.

(Steps 2-9: esterification)

Finally, the compound (b8) may be reacted with an alcohol (R) in the presence of a condensing agent and a base₁-OH) to obtain compound (b9) (R L)₂-X₁-R₂) (corresponding to the cationic lipid of formula (1)). Condensing agents and bases similar to those of step 1-1 may be used.

In the above scheme 2, the compound (b6) obtained in step 2-6 is esterified with 1-methyl-pyrrolidine-3-carboxylic acid or a derivative thereof (step 2-7), and then with an alcohol (R)₁OH) to carry out the esterification reaction (steps 2 to 9). However, as shown in scheme 2' below, the hydroxyl group of the compound (b6) obtained in step 2-6 may be protected, a benzyl group may be deprotected and an alcohol (R) may be reacted with₁-OH) and then with 1-methyl-pyrrolidine-3-carboxylic acid or a derivative thereof.

In the formula, L₁And R₁Are each as defined in formula (1) above, and R in formula (1) is-L₂-X₁-R₂-(L₂、X₁And R₂Respectively as defined in formula (1) above).

(Steps 2-7': protection)

Protecting the hydroxyl group of the compound (b6) obtained in the step 2-6. For example, tert-butyldimethylsilyl chloride (TBDMS-Cl) is reacted with it in a solvent such as N, N-dimethylformamide in the presence of a base such as imidazole to obtain a compound (b10) in which the hydroxyl group is protected with a tert-butyldimethylsilyl group (TBDMS).

(Steps 2-8': deprotection)

Then, the benzyl protecting group is deprotected under reducing conditions to obtain compound (b 11). Deprotection can be carried out, for example, by catalytic hydrogenation in the presence of a metal catalyst such as palladium on carbon.

(Steps 2-9': esterification)

Reacting the obtained compound (b11) with an alcohol (R) in the presence of a condensing agent and a base₁-OH) to obtain compound (b 12). Condensing agents and bases similar to those of step 1-1 may be used.

(Steps 2-10': deprotection)

Then, the TBDMS group is deprotected to obtain compound (b 13). Deprotection can be carried out, for example, by reaction with a fluoride salt such as tetra-n-butylammonium fluoride (TBAF) in an organic solvent such as tetrahydrofuran.

(Steps 2-11': esterification)

Finally, in analogy to steps 1-7, the obtained alcohol (b13) is reacted with 1-methyl-pyrrolidine-3-carboxylic acid or its derivative (hydrogen halide, etc.) in the presence of a condensing agent and a base to obtain the final product compound (b14) (R ═ L)₂-X₁-R₂) (corresponding to the cationic lipid of formula (1)).

In the formula, L₁And R₁Are each as defined in formula (1) above, and R in formula (1) is-L₂-X₁-R₂(L₂、X₁And R₂Respectively as defined in formula (1) above).

(Steps 2-11: esterification)

Alternatively, instead of steps 2 to 11', a carboxylic acid in which the nitrogen atom on the pyrrolidine ring is protected with a protecting group (e.g., t-butoxycarbonyl (tBu-O-CO-; Boc)) or a derivative thereof may be reacted with an alcohol (b13) in the presence of a condensing agent and a base similarly to steps 1 to 7 to obtain a compound (b 15).

(Steps 2-12 ": deprotection/reductive amination)

Then, the tert-butoxycarbonyl group (Boc) of compound (b15) was deprotected and methylated by reductive amination. In particular, the Boc group of compound (b15) is deprotected by reaction with a strong acid, such as trifluoroacetic acid (TFA), to obtain NH, which is reacted with formaldehyde to generate an imine (iminium cation), which is further reacted with a reducing agent, such as nabh (oac)₃Or NaBH₃CN) to obtain a final product amine compound (b14) (R L)₂-X₁-R₂) (corresponding to the cationic lipid of formula (1)).

In the above step 2-11' or step 2-11 ″, as the carboxylic acid or its derivative, a starting material in which the configuration of the carbon atom at the position of the pyrrolidine ring 3 is controlled, such as (3S) -1-methyl-pyrrolidine-3-carboxylic acid or (3R) -1-methyl-pyrrolidine-3-carboxylic acid or its derivative, may be used to control the configuration of the pyrrolidine ring in the compound having the formula (1).

When synthesizing X therein₁When the compound is a compound of-CO-O- (e.g., a compound having formula (1 a)), a compound whose carboxyl group is protected according to the above-mentioned step 2-1 (ester compound) can be prepared in scheme 2, the compound can be reacted with the compound (b2) in step 2-3, the obtained compound can be further subjected to the subsequent steps, and deprotection and esterification can be carried out in steps 2-8 and 2-9 or steps 2-8 'and 2-9'. By using different types of protecting groups which can be deprotected under deprotection conditions in which two carboxyl groups are different from each other, it is possible to obtain a compound in which R is₁And R₂A different compound.

In the above scheme, wherein R in formula (1) is shown exemplarily₃Being a combination of methyl groupsThe method is provided. However, it is also possible to synthesize wherein R according to the above scheme by using 1-alkyl-pyrrolidine-3-carboxylic acid instead of 1-methyl-pyrrolidine-3-carboxylic acid in steps 1-7 or steps 2-7 above₃Compounds which are not methyl groups.

In the synthesis of the compounds of the present invention, unless otherwise specified for the production of starting materials, the compounds are known or prepared according to analogous methods well known in the art or as described in the examples below. It will be appreciated by those skilled in the art that the above schemes are merely exemplary methods of preparation of the compounds of the invention and that other well known methods may be employed.

In the preparation of the compounds of the present invention, it may be necessary and/or desirable to protect functional groups of the molecule. This can be carried out with conventional protecting groups well known to the person skilled in the art. The protecting group may be removed at any suitable subsequent stage according to methods well known in the art. The protecting groups indicated in the above schemes (e.g., t-butyl protecting groups, t-butoxycarbonyl protecting groups, benzyl protecting groups, and t-butyldimethylsilyl protecting groups) may be replaced by other protecting groups well known to those skilled in the art.

< lipid Complex >

The present invention provides a lipid complex comprising (I) the above cationic lipid and (II) at least one lipid selected from the group consisting of neutral lipids, polyethylene glycol-modified lipids and sterols. A lipid complex according to an embodiment of the present invention contains (I) the above-described cationic lipid, (II) at least one lipid selected from the group consisting of a neutral lipid, a polyethylene glycol-modified lipid, and a sterol, and (III) a nucleic acid. Thus, the lipid complexes of the invention may or may not contain nucleic acids. The lipid complexes of the present example allow for efficient release of nucleic acids into the cytoplasm. After storage for a certain period of time (e.g., 1 month, 1.5 months, or 3 months), the particle size of the lipid complex of the present embodiment does not increase, and may exhibit excellent physical stability.

Examples of the form of a complex formed from a lipid containing a cationic lipid and a nucleic acid include a complex of a nucleic acid and a membrane (reverse micelle) formed from a lipid monolayer (monolayer), a complex of a nucleic acid and a liposome, a complex of a nucleic acid and a micelle, and the like. In the lipid complex according to one embodiment of the present invention, the nucleic acid is encapsulated in a fine particle formed of a lipid containing a cationic lipid.

The lipid complex of the present example contains, for example, 10% to 100% by mole (such as 20% to 90% by mole, such as 40% to 80% by mole) of cationic lipid based on the total lipid content of the lipid complex. The cationic lipids used may be used alone or in a mixture of two or more.

Examples of nucleic acids include siRNA, miRNA, shRNA expression vectors, antisense oligonucleotides, mRNA, ribozymes, and the like. In one embodiment, the nucleic acid may be an siRNA, miRNA, or mRNA.

The lipid complex of the present embodiment contains, for example, 0.01 to 50% by weight (such as 0.1 to 30% by weight, such as 1 to 10% by weight) of the nucleic acid, relative to the total weight of the lipid complex.

The lipid complex of the present example (as a lipid component) contains (I) a cationic lipid and (II) at least one lipid selected from the group consisting of a neutral lipid, a polyethylene glycol-modified lipid, and a sterol. The lipid complex of the present embodiment contains, for example, 50 to 100% by weight (such as 70 to 99.99% by weight, such as 90 to 99% by weight) of the lipid component, relative to the total weight of the lipid complex.

Examples of neutral lipids include Dioleoylphosphatidylethanolamine (DOPE), palmitoleoylphosphatidylcholine (POPC), egg phosphatidylcholine (egg phosphatidylcholine, EPC), Dimyristoylphosphatidylcholine (DMPC), Dipalmitoylphosphatidylcholine (DPPC), Distearoylphosphatidylcholine (DSPC), arachidoylphosphatidylcholine (DAPC), bisdocosanylphosphatidylcholine (DBPC), bislignocetylphosphatidylcholine (DIlignoylphosphatidylcholine, D L PC), Dioleoylphosphatidylcholine (DOPC), sphingomyelin, ceramide, Dioleoylphosphatidylglycerol (DOPG), Dipalmitoylphosphatidylcholine (DPPE), dioleoylphosphatidylethanolamine (POPE), dioleoylphosphatidylethanolamine 4- (N-methyl cyclohexane-1-carbamate), and the like, and mixtures of two or more neutral lipids may be used alone or in combination.

The lipid complex of the present embodiment may contain, for example, 0% to 50% by mole (such as 0% to 40% by mole, such as 0% to 30% by mole) of neutral lipids, based on the total lipid content in the lipid complex.

Examples of polyethylene glycol modified lipids include PEG2000-DMG (PEG 2000-dimyristyl glycerol), PEG2000-DPG (PEG 2000-dipalmitoyl glycerol), PEG2000-DSG (PEG 2000-distearoyl glycerol), PEG5000-DMG (PEG 5000-dimyristyl glycerol), PEG5000-DPG (PEG 5000-dipalmitoyl glycerol), PEG5000-DSG (PEG 5000-distearoyl glycerol), PEG-cDMA (N- [ (methoxypoly (ethylene glycol) 2000) carbamoyl ] -1, 2-dimyristyloxypropyl (oxypropylpropyl) -3-amine), PEG-C-DOMG (R-3- [ (omega-methoxy-poly (ethylene glycol) 2000) carbamoyl ] -1, 2-dimyristyloxypropyl-3-amine), Polyethylene glycol (PEG) -Diacylglycerol (DAG), PEG-Dialkyloxypropyl (DAA), PEG-phospholipid, PEG-ceramide (Cer), and the like.

Examples of PEG-dialkyloxypropyl groups include PEG-dilauryloxypropyl, PEG-dimyristoyloxypropyl, PEG-dipalmitoyloxypropyl, PEG-distearyloxypropyl, and the like.

The polyethylene glycol-modified lipid may be used alone or in a mixture of two or more. The polyethylene glycol-modified lipid may have a terminal of PEG (polyethylene glycol) that is methylated (MPEG; methoxy (polyethylene glycol)).

The lipid complex of the present embodiment may contain, for example, 0% to 30% by mole (such as 0% to 20% by mole, such as 0% to 10% by mole) of a polyethylene glycol-modified lipid based on the total lipid content in the lipid complex.

Examples of sterols include cholesterol, dihydrocholesterol, lanosterol, β -sitosterol, campesterol, stigmasterol, brassicasterol, ergosterol, fucosterol, 3 β - [ N- (N ', N' -dimethylaminoethyl) carbamoyl ] cholesterol (DC-Chol), and the like.

The lipid complex of the present embodiment may contain, for example, 0% to 90% by mole (such as 10% to 80% by mole, such as 20% to 50% by mole) of a sterol, based on the total lipid content in the lipid complex.

The lipid components in the lipid complex of the present embodiment may be combined without any limitation, and examples of the combination include a combination of the above-described cationic lipid, neutral lipid, and sterol, a combination of the above-described cationic lipid, neutral lipid, polyethylene glycol-modified lipid, and sterol, and the like.

The "average particle diameter" of the lipid complex of the present embodiment can be calculated from any of the volume average value, the number average value, and the Z-average value. The lipid complex of the present embodiment may have an average particle diameter (Z-average) of, for example, 10 to 1000nm (e.g., 30 to 500nm, e.g., 30 to 200 nm).

The lipid complex of the present embodiment preferably minimizes an increase in particle size of the lipid complex during storage as compared to before storage. For example, the average particle diameter (Z-average) after storage at 4 ℃ for 1.5 months is preferably 1.25 times or less, more preferably 1.2 times or less, and particularly preferably 1.1 times or less the particle diameter before storage.

From the viewpoint of preventing nonspecific adsorption and immunoreaction, the lipid complex of the present embodiment preferably has almost no surface charge in an environment of pH of about 7.4 (such as in blood). In addition, from the viewpoint of improving the efficiency of fusion with the endosomal membrane during incorporation into the cell by endocytosis, it is preferable to positively charge the lipid complex in an environment of low pH (for example, 3.5 to 7.0).

< composition >

The present invention provides a composition comprising (I) the above cationic lipid, (II) at least one lipid selected from the group consisting of a neutral lipid, a polyethylene glycol-modified lipid, and a sterol, and (III) a nucleic acid. In one embodiment of the invention, the composition comprises a lipid complex comprising a nucleic acid as described above. The compositions of the present example allow for efficient release of nucleic acids into the cytoplasm. The composition of this embodiment may contain the lipid complex described above, a pharmaceutically acceptable medium, and optionally other additives. The pharmaceutically acceptable medium and other additives are described below.

The composition of the invention contains, for example, 10 to 100% by moles (such as 20 to 90% by moles, such as 40 to 70% by moles) of cationic lipids based on the total lipid content in the composition. The cationic lipids may be used alone or in a mixture of two or more.

Examples of the nucleic acid include those described above. The composition of the present embodiment contains, for example, 0.01 to 50% by weight (such as 0.1 to 30% by weight, such as 1 to 10% by weight) of the nucleic acid, relative to the total weight of the composition.

The composition of the present invention contains (as a lipid component) the above cationic lipid (I) and (II) at least one lipid selected from the group consisting of neutral lipids, polyethylene glycol-modified lipids and sterols.

Examples of neutral lipids include those described above. The composition of the invention may contain, for example, 0% to 50% by moles (such as 0% to 40% by moles, such as 0% to 30% by moles) of neutral lipids based on the total lipid content in the composition.

Examples of polyethylene glycol modified lipids include those described above. The composition of the invention may contain, for example, from 0% to 30% by moles (such as from 0% to 20% by moles, such as from 0% to 10% by moles) of a polyethylene glycol modified lipid based on the total lipid content in the composition.

Examples of sterols include those described above. The composition of the invention may contain, for example, 0% to 90% by moles (such as 10% to 80% by moles, such as 20% to 50% by moles) of sterols, based on the total lipid content in the composition.

The lipid component in the composition of the present invention may be combined without any limitation, and examples thereof include a combination of the above-mentioned cationic lipid, neutral lipid and sterol, a combination of the above-mentioned cationic lipid, neutral lipid, polyethylene glycol-modified lipid and sterol, and the like.

The compositions of the invention may contain, as further additives, sugars (such as sucrose, glucose, sorbitol and lactose); amino acids (such as glutamine, glutamic acid, sodium glutamate, and histidine); salts of acids such as citric, phosphoric, acetic, lactic, carbonic, and tartaric acids, and the like.

The compositions of the present invention may be formulated as pharmaceutical compositions. Examples of the dosage form of the pharmaceutical composition include injections.

The composition of the present invention may be in, for example, a powder state (obtained by removing a solvent by freeze-drying or the like) or a liquid state. The composition according to one embodiment of the present invention is a powder composition containing the lipid complex according to the above-described embodiment. The powder composition may be prepared from the composition in a liquid state (dispersion) by removing the solvent (e.g., filtration or centrifugation), or by freeze-drying the dispersion. When the composition is in a powder state, it may be suspended or dissolved in a pharmaceutically acceptable medium before use as an injection. A composition according to one embodiment of the invention is a liquid composition comprising a lipid complex according to the above embodiments and a pharmaceutically acceptable medium. When the composition is in a liquid state, the composition can be used as it is or as an injection after dissolving it in a pharmaceutically acceptable medium.

Examples of pharmaceutically acceptable media include sterile water; brine; isotonic solutions containing adjuvants (e.g., glucose, D-sorbitol, D-mannose, D-mannitol, and sodium chloride); buffers such as phosphate buffer, citrate buffer, and acetate buffer; and so on. The composition of the present embodiment may further contain additives including dissolution adjuvants such as alcohols (including ethanol, propylene glycol and polyethylene glycol), stabilizers, antioxidants, antibacterial agents, vehicles generally used in pharmaceutical production, fillers, bulking agents, binders, wetting agents, disintegrating agents, lubricants, surfactants, dispersing agents, preservatives, flavoring agents, demulcents, and the like.

The compositions may be administered to a patient parenterally (e.g., by intraarterial injection, intravenous injection, and subcutaneous injection). The dosage of the composition may vary depending on the subject to be administered, the target organ, the symptom, or the mode of administration. There is no limitation on the subject to which the composition is administered, and the composition can be applied to a variety of animals. In particular, the compositions may be administered to mammals, preferably humans and laboratory animals, in clinical testing, screening and laboratory experiments.

< method for producing composition >

In one embodiment, the present invention provides a method for producing a composition, the method comprising: a step (a) of mixing an aqueous solution containing a polar organic solvent containing (I) the above-mentioned cationic lipid, (II) at least one lipid (selected from the group consisting of a neutral lipid, a polyethylene glycol-modified lipid and a sterol) with an aqueous solution containing (III) a nucleic acid to obtain a mixed solution; and (b) reducing the percentage of the polar organic solvent in the mixed solution. The production method according to the present example allows the production of a composition capable of efficiently releasing nucleic acid into the cytoplasm.

Lipid complexes containing nucleic acids encapsulated in lipid-formed fine particles can be formed by electrostatic interaction between water-soluble nucleic acids and cationic lipids and hydrophobic interaction between lipids. For example, the solubility of lipid components in an aqueous solution containing a polar organic solvent, which include (I) the above-mentioned cationic lipid and (II) at least one lipid selected from the group consisting of a neutral lipid, a polyethylene glycol-modified lipid and a sterol, can be changed by decreasing the content percentage of the polar organic solvent in the mixed solution, thereby forming a lipid complex. Examples of polar organic solvents include alcohols, such as ethanol.

First, in step (a), an aqueous solution containing a polar organic solvent containing (I) a cationic lipid and (II) at least one lipid selected from the group consisting of a neutral lipid, a polyethylene glycol-modified lipid, and a sterol (dissolved therein) is mixed with an aqueous solution containing (III) a nucleic acid to obtain a mixed solution. The concentration of the polar organic solvent in the aqueous solution containing the polar organic solvent is not particularly limited as long as the lipid molecule can be dissolved even after being mixed with the aqueous solution of nucleic acid. For example, the concentration of the polar organic solvent in the polar organic solvent-containing aqueous solution in step (a) may be 0% to 60% by weight.

Then, in step (b), water or the like is added to the mixed solution to reduce the content percentage of the polar organic solvent. As a result, a lipid complex may be formed. In order to efficiently form the lipid complex, it is preferable to rapidly decrease the content percentage of the polar organic solvent. For example, the concentration of the polar organic solvent in the final polar organic solvent-containing aqueous solution in step (b) may be 0% to 5% by weight.

Alternatively, the mixed solution obtained in step (a) may be dialyzed to remove the polar organic solvent and replace the solvent with a pharmaceutically acceptable medium. Lipid complexes may form due to the reduced percentage of polar organic solvents in the solution during dialysis.

According to the method for producing a composition of the present embodiment, a lipid complex containing a nucleic acid effectively encapsulated in a fine particle can be obtained. The lipid complex may have excellent physical stability. For example, the increase in particle size may be minimized after storage over a period of time (e.g., 1 month or 3 months).

When the nucleic acid encapsulated in the composition is an oligonucleotide therapeutic, the composition can be used as a pharmaceutical composition. For example, the compositions of the invention may be used in therapy (e.g., gene therapy) for introducing a desired nucleic acid into a target cytoplasm (e.g., a disease-causing cytoplasm) in vivo or in vitro. Thus, the present invention provides, according to one embodiment, a method for treating various diseases (particularly gene therapy methods) by using a pharmaceutical composition containing a lipid complex. The subject to be administered, the method of administration and the conditions are the same as described above.

One embodiment of the invention can be a kit for delivering a nucleic acid therapeutic, the kit comprising a cationic lipid. The kit may also preferably be used in the treatment of a variety of target cells (e.g., gene therapy). In the kit of the present embodiment, the storage state of the cationic lipid is not particularly limited, and it may be in any state (such as a solution or a powder) in consideration of stability (storage characteristics), convenience of use, and the like. In addition to the cationic lipid, the kit of the present embodiment may contain, for example, various nucleic acids, various media (pharmaceutically acceptable media, buffers), instructions (instruction manual), and the like. The kit of the present example is used to prepare a composition or lipid complex containing a desired nucleic acid to be introduced into a target cell and a lipid containing the above cationic lipid. The prepared composition or lipid complex can be effectively used for delivering nucleic acid to target cells. Further, one embodiment of the invention can be a kit for delivering a nucleic acid therapeutic agent, the kit containing a pharmaceutical composition comprising a cationic lipid. The kit of the present embodiment may contain, for example, various media (pharmaceutically acceptable media), instructions (instruction manual), and the like in addition to the pharmaceutical composition.

Examples of the invention

In the examples and production examples, the designation of the compounds is obtained by software (manufactured by platinum elmer co., L td., product name "ChemDraw plug 15.1 edition").

All starting materials, reagents, acids, bases, dehydrating agents, solvents and catalysts for the synthesis of the compounds of the invention are commercially available or can be prepared according to organic synthesis methods well known to the person skilled in the art. Furthermore, as shown in the examples below, the compounds of the present invention may be prepared according to organic synthesis methods well known to those skilled in the art.

The abbreviations used in the examples are conventional and well known to those skilled in the art. Some abbreviations are shown below.

DIPEA: n, N-diisopropylethylamine

DMAP: 4- (dimethylamino) pyridine

DMSO, DMSO: dimethyl sulfoxide

DMF: n, N-dimethylformamide

EDC. HCl: 1-Ethyl-3- (3-dimethylaminopropyl) carbodiimide hydrochloride

n-: is just

tert-: tertiary amine

TFA: trifluoroacetic acid

THF: tetrahydrofuran (THF)

L AH lithium aluminum hydride

TBAF: tetra-n-butylammonium fluoride

¹H NMR: proton nuclear magnetic resonance spectroscopy

In the following examples and production examples, "room temperature" generally indicates about 10 ℃ to about 35 ℃. Unless otherwise indicated, "%" indicates weight percent.

Chemical shifts of proton nuclear magnetic resonance spectroscopy are reported in units (ppm) from tetramethylsilane. Abbreviations in the spectra are as follows:

s: singlet, d: doublet, t: triplet, q: quartet, quin: quintuple, m: multiplet, br: broad peak.

For the chromatography, Parallel Prep { column: produced by Yamazen Corporation, Hi-Flash column (silica gel)), size: S (16 × 60mm), M (20 × 75mm), L (26 × 100mm), 2L (26 × 150mm) }, or Isolera { column: SNAPCartridge KP-Sil (10g, 25g, 50g, 100g, 340g) }, a rapid automatic purification system produced by Bytaizi Corporation (Biotage), was used.

A. Synthesis of cationic lipids

[ production example 1]

Synthesis of benzyl 9-bromononanoate

Benzyl alcohol (1.3m L, 12.6mmol), 9-bromononanoic acid (3.0g, 12.65mmol) and DMAP (155mg, 1.27mmol) were dissolved in dichloromethane (25m L), EDC · HCl (2.67g, 13.92mmol) was added thereto under ice cooling, and the mixture was stirred at room temperature for 2 hours, a saturated aqueous sodium bicarbonate solution was added to the reaction mixture and extracted with diethyl ether, the organic phase was washed with a saturated sodium chloride solution and dried over anhydrous magnesium sulfate, after filtration, the solvent was removed by distillation under reduced pressure, and the residue was purified by silica gel column chromatography (n-heptane/ethyl acetate) to obtain the title compound (3.7g, 11.31 mmol).

¹H-NMR(400MHz，CDCl₃)(ppm)：1.22-1.48(m，8H)，1.58-1.71(m，2H)，1.78-1.90(m，2H)，2.30-2.40(m，2H)，3.35-3.44(m，2H)，5.12(s，2H)，7.26-7.45(m，5H)。

[ production example 2]

Synthesis of 4-pentylnonan-1-ol

(1) Synthesis of 2-pentylheptan-1-ol

2-Pentylheptanoic acid (2.0g, 9.98mmol) was dissolved in THF (50M L), borane-THF complex (1.0M, 25.0M L, 25.0mmol) was added dropwise thereto at-78 deg.C, the mixture was allowed to warm to room temperature and stirred overnight, the mixture was cooled again to-78 deg.C, further borane-THF complex (1.0M, 10.0M L, 10.0mmol) was added, and the mixture was stirred at room temperature overnight, saturated aqueous ammonium chloride solution was added and extracted with ether, the organic phase was washed with saturated sodium chloride solution and dried over anhydrous magnesium sulfate, after filtration, the solvent was removed by distillation under reduced pressure, and the residue was purified by silica gel column chromatography (cyclohexane/ethyl acetate) to obtain the title compound (1.40g, 7.49 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.2Hz，6H)，1.24-1.35(m，19H)，1.45-1.47(m，1H)，1.62-1.71(m，1H)，3.54(br d，J＝5.5Hz，2H)。

(2) Synthesis of 2-pentylheptanal

To a solution of oxalyl chloride (1.3m L, 15.0mmol) in dichloromethane (1.0m L) at-78 ℃ was added dropwise a solution of DMSO (2.1m L, 30.0mmol) in dichloromethane (1.0m L) after stirring for 30 minutes, a solution of the compound (1.40g, 7.49mmol) obtained in production example 2- (1) in dichloromethane (2.0m L) was added after stirring for 1 hour, triethylamine (5.2m L, 37.5mmol) was added after heating to room temperature, the mixture was stirred for 2 hours, and water was added to separate the organic phase, the organic phase was washed with water and a saturated sodium chloride solution, and the solvent was removed by distillation under reduced pressure.

¹H-NMR(600MHz，CDCl3)(ppm)：0.89(t，J＝6.8Hz，7H)，1.19-1.34(m，13H)，1.40-1.47(m，4H)，1.57(s，1H)，1.58-1.66(m，2H)，2.15-2.28(m，1H)，2.66(s，1H)，9.56(d，J＝3.3Hz，1H)。

(3) Synthesis of 4-pentylnon-2-enoic acid ethyl ester

To a solution of ethoxycarbonylmethyl (triphenyl) phosphorus bromide (2.23g, 5.19mmol) in THF (14M L) at-78 ℃, a sodium hexamethyldisilazane-THF solution (1M, 5.2M L, 5.19mmol) was added dropwise, after heating to 0 ℃ over 2 hours, a solution of the compound obtained in production example 2- (2) (0.48g, 2.59mmol) in THF (4.0M L) was added dropwise via a cannula, after stirring overnight at room temperature, the mixture was refluxed under heating for 4 hours, water was added and extracted with ether, the organic phase was washed with a saturated sodium chloride solution and dried over anhydrous magnesium sulfate, after filtration, the solvent was removed by distillation under reduced pressure, the residue was purified by silica gel column chromatography (cyclohexane/ether) to obtain the title compound (0.28g, 1.09 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(br t，J＝7.2Hz，5H)，0.87(br t，J＝7.0Hz，6H)，1.18-1.35(m，26H)，1.38-1.46(m，3H)，1.53-1.64(m，4H)，2.09-2.24(m，1H)，2.38(t，J＝7.5Hz，3H)，4.19(q，J＝7.0Hz，2H)，5.76(d，J＝15.8Hz，1H)，6.74(dd，J＝15.6，9.4Hz，1H)。

(4) Synthesis of 4-pentylnonan-1-ol

To a solution of the compound (0.28g, 1.10mmol) obtained in production example 2- (3) in THF (2.2M L) at 0 ℃ under a nitrogen atmosphere was added dropwise L AH-THF solution (1M, 2.2M L, 2.2mmol), the mixture was heated to room temperature and refluxed under heating for 18 hours, the mixture was diluted with tert-butyl methyl ether (4.6M L) at 0 ℃, and then water (0.078M L), aqueous sodium hydroxide solution (15%, 0.078M L) and water (0.234M L) were sequentially added, the reaction mixture was stirred for 15 minutes, filtered through Celite and washed with ether, the filtrate was concentrated, and the residue was purified by silica gel column chromatography (cyclohexane/ether) to obtain the title compound (0.048g, 0.22 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.2Hz，6H)，1.19-1.33(m，21H)，1.43(s，1H)，1.47(br s，1H)，1.50-1.58(m，2H)，3.62(t，J＝6.8Hz，2H)。

[ production example 3]

Synthesis of 3-pentyloctyl 9-bromononanoate

To a solution of 9-bromononanoic acid (1.61g, 6.77mmol) in dichloromethane (35m L) was added oxalyl chloride (0.95m L, 10.8mmol) under ice-cooling, and then DMF (0.050m L, 0.68mmol) over 40 minutes, after stirring at room temperature for 40 minutes, the mixture was concentrated under reduced pressure and azeotroped with toluene, the residue was dissolved in dichloromethane (35m L), 3-pentyloctane-1-ol (1.36g, 6.77mmol) was added, and the mixture was stirred at room temperature for 1 hour, a saturated aqueous sodium bicarbonate solution was added to the reaction mixture and extracted with diethyl ether, the organic phase was washed with a saturated sodium chloride solution and dried over anhydrous magnesium sulfate, after filtration, the solvent was removed by distillation under reduced pressure, the residue was purified by silica gel column chromatography (cyclohexane/diethyl ether) to obtain the title compound (2.22g, 5.28 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.3Hz，6H)，1.22-1.35(m，22H)，1.37-1.47(m，3H)，1.53-1.66(m，5H)，1.86(quin，J＝7.2Hz，2H)，2.29(t，J＝7.5Hz，2H)，3.41(t，J＝7.0Hz，2H)，4.09(t，J＝7.2Hz，2H)。

[ production example 4]

Synthesis of 3-octylundecan-1-ol

(1) Synthesis of ethyl (E) -2-undecenoate

To a suspension of ethyl 2- (diethoxyphosphoryl) acetate (5.0m L, 25.3mmol) in THF (40m L) under ice-cooling was gradually added 60% sodium hydride (0.93g, 23.2mmol) after 30 minutes, a solution of nonyl aldehyde (3.6m L, 21.1mmol) in THF (40m L) was added dropwise and stirred for 30 minutes after stirring at room temperature for 2 hours, the mixture was extracted with ethyl acetate, the organic phase was dried over anhydrous magnesium sulfate, and after filtration the solvent was removed by distillation under reduced pressure, under ice-cooling, to a suspension of ethyl 2- (diethoxyphosphoryl) acetate (2.5m L, 12.7mmol) in THF (20m L) was added gradually 60% sodium hydride (1.0g, 25.0mmol), and then to a solution of the crude product obtained above in THF (20m L) under ice-cooling was added water after stirring for 1 hour, the organic phase was extracted with ethyl acetate and the organic phase was purified by distillation over anhydrous magnesium sulfate, the title compound was purified by silica gel column chromatography (3.07).

¹H-NMR(600MHz，CDCl₃)(ppm)：1.22-1.35(m，14H)，1.41-1.50(m，2H)，2.15-2.23(m，2H)，4.14-4.22(m，2H)，5.81(dt，J＝15.6，1.5Hz，1H)，6.96(dt，J＝15.6，7.0Hz，1H)。

(2) Synthesis of ethyl 3-octylundecanoate

Copper (I) bromide (0.21g, 1.45mmol) and lithium chloride (0.12g, 2.89mmol) were suspended in THF (40M L) and stirred at room temperature for 10 minutes under ice-cooling, the compound (3.07g, 14.46mmol) obtained in production example 4- (1) and chlorotrimethylsilane (2.2M L, 17.4mmol) were added in this order and stirred for 20 minutes, octylmagnesium bromide-THF solution (2.0M, 8.7M L, 17.4mmol) was added dropwise and stirred for 1.5 hours, saturated aqueous ammonium chloride solution was added and extracted with ether, the organic phase was washed with saturated sodium chloride solution and dried over anhydrous magnesium sulfate, after filtration, the solvent was removed by distillation under reduced pressure, and the residue was purified by silica gel column chromatography (cyclohexane/ether) to obtain the title compound (4.43g, 13.58 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.88(t，J＝7.1Hz，6H)，1.19-1.33(m，34H)，1.35-1.35(m，1H)，1.84(br d，J＝5.0Hz，1H)，2.21(d，J＝7.0Hz，2H)，4.12(q，J＝7.2Hz，2H)。

(3) Synthesis of 3-octylundecan-1-ol

To a solution of the compound (4.43g, 13.56mmol) obtained in production example 4- (2) in THF (30M L) at room temperature under a nitrogen atmosphere was added dropwise L AH-THF solution (2M, 13.6M L, 27.1mmol), after heating at 65 ℃ for 5 hours, water (1M L), aqueous sodium hydroxide solution (2M, 1M L) and water (2M L) were added in this order under ice-cooling, the reaction mixture was stirred for 10 minutes, filtered through Celite and washed with ether, the filtrate was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (cyclohexane/ether) to obtain the title compound (4.43g, quantitative).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.88(t，J＝7.1Hz，6H)，1.12(br s，1H)，1.19-1.33(m，30H)，1.39-1.44(m，2H)，1.49-1.54(m，2H)，3.62-3.71(m，2H)。

[ production example 5]

Synthesis of 3-octyl undecyl 6-bromohexanoate

The compound obtained in production example 4 (3.46g, 12.16mmol), 6-bromohexanoic acid (2.61g, 13.38mmol) and DMAP (0.15g, 1.22mmol) were dissolved in dichloromethane (22m L), EDC · HCl (2.91g, 15.20mmol) was added thereto under ice-cooling, and the mixture was stirred at room temperature for 3 days

To obtain the title compound (4.67g, 10.09 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.88(t，J＝7.0Hz，6H)，1.21-1.32(m，30H)，1.39(br s，1H)，1.44-1.51(m，2H)，1.57(q，J＝7.0Hz，2H)，1.66(quin，J＝7.6Hz，2H)，1.84-1.91(m，2H)，2.31(t，J＝7.4Hz，2H)，3.40(t，J＝6.7Hz，2H)，4.09(t，J＝7.2Hz，2H)。

[ production example 6]

Synthesis of benzyl 4-bromobutyrate

To a solution of 4-bromobutanoic acid (2.94g, 17.61mmol) in dichloromethane (88m L) at room temperature was added oxalyl chloride (1.6m L, 18.5mmol) and DMF (0.40m L, 1.8mmol) in this order, after stirring at room temperature for 30 minutes, benzyl alcohol (1.90mg, 17.61mmol) was added and stirred for 15 minutes, the reaction mixture was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (cyclohexane/diethyl ether) to obtain the title compound (3.64g, 14.09 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：1.61(s，1H)，2.21(quin，J＝6.8Hz，2H)，2.57(t，J＝7.3Hz，2H)，3.47(t，J＝6.4Hz，2H)，5.15(s，2H)，7.33-7.40(m，5H)。

[ production example 7]

Synthesis of 4-nonyltridec-1-ol

(1) Synthesis of ethyl (E) -2-dodecenoate

To a suspension of 60% sodium hydride (1.28g, 32.0mmol) in 1, 2-dimethoxyethane (70m L) was added ethyl 2- (diethoxyphosphoryl) acetate (6.4m L, 32.0mmol) dropwise under ice-cooling, after 20 minutes, a solution of decanal (5.0m L, 32.0mmol) in 1, 2-dimethoxyethane (30m L) was added, and the mixture was stirred at room temperature overnight, a saturated aqueous ammonium chloride solution was added, and extracted with ethyl acetate, the organic phase was dried over anhydrous magnesium sulfate, and after filtration, the solvent was removed by distillation under reduced pressure, the residue was purified by silica gel column chromatography (n-pentane/ether) to obtain the title compound (5.18g, 23.0 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.88(t，J＝7.06Hz，4H)，1.25-1.32(m，18H)，1.45(dt，J＝14.5，7.3Hz，2H)，2.15-2.22(m，2H)，4.15-4.26(m，2H)，5.72-5.90(m，1H)，6.96(dt，J＝15.6，7.0Hz，1H)。

(2) Synthesis of ethyl 3-nonyldodecanoate

The title compound (2.76g, 7.84mmol) was obtained according to the method in production example 4- (2) from the compound (2.22g, 9.80mmol) obtained in production example 7- (1), copper (I) bromide (0.141g, 0.98mmol), lithium chloride (0.083g, 1.96mmol), chlorotrimethylsilane (1.4M L, 10.8mmol), nonylmagnesium bromide-THF solution (1.0M, 10.8M L, 10.8mmol) and THF (53M L).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.77(t，J＝7.0Hz，9H)，1.04(br d，J＝7.3Hz，1H)，1.11-1.26(m，48H)，1.29-1.39(m，1H)，1.44(s，1H)，1.68-1.84(m，1H)，2.05-2.09(m，1H)，2.09-2.16(m，2H)，3.46(t，J＝6.8Hz，1H)，3.42-3.49(m，1H)，4.01(q，J＝7.0Hz，2H)，4.07(q，J＝7.3Hz，1H)，5.70(dt，J＝15.7，1.5Hz，1H)，6.85(dt，J＝15.8，7.0Hz，1H)，7.15(s，1H)。

(3) Synthesis of 3-nonyl-dodecane-1-ol

The title compound (1, 34g, 4.29mmol) was obtained according to the method in production example 4- (3) from the compound (2.76g, 7.80mmol) obtained in production example 7- (2), L AH-THF solution (1M, 10.1M L, 10.1mmol) and THF (15M L).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.0Hz，6H)，1.18(brs，2H)，1.23-1.33(m，33H)，1.43(br d，J＝9.9Hz，1H)，1.53(q，J＝6.8Hz，2H)，1.59(br s，1H)，3.67(t，J＝7.2Hz，2H)。

(4) Synthesis of 3-nonyl dodecane

The title compound (0.30g, quantitative) was obtained from the compound (0.30g, 0.97mmol) obtained in production example 7- (3), oxalyl chloride (0.17m L, 1.94mmol), DMSO (0.27m L, 3.88mmol) and triethylamine (0.68m L, 4.85mmol) according to the method in production example 2- (2).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.0Hz，6H)，1.15-1.38(m，1H)，1.44(s，9H)，1.55(s，1H)，1.95(br s，1H)，2.33(dd，J＝6.6，2.6Hz，2H)，9.77(t，J＝2.4Hz，1H)。

(5) Synthesis of 10- (3-methoxyallyl) nonadecane

After dropwise addition of a sodium hexamethyldisilazane-THF solution (1M, 3.2M L, 3.2mmol) to a solution of (methoxymethyl) triphenylphosphonium chloride (1.10g, 3.21mmol) in THF (5.0M L) at-78 ℃ for 15 minutes, the mixture was added to a solution of the compound (0.50g, 1.60mmol) obtained in production example 7- (4) in THF (2.0M L) through a cannula under ice-cooling, after stirring for 1.5 hours, water was added and extracted with ether, the organic phase was washed with a saturated sodium chloride solution and dried over anhydrous magnesium sulfate, after filtration, the solvent was removed by distillation under reduced pressure, the residue was purified by silica gel column chromatography (cyclohexane/ether) to obtain the title compound (0.33g, 0.98 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.0Hz，6H)，1.20-1.35(m，28H)，1.41-1.48(m，1H)，1.55(s，1H)，1.88(t，J＝6.4Hz，1H)，1.96-2.11(m 1H)，3.52(s，1H)，3.57(s，1H)，4.32(q，J＝7.3Hz，1H)，4.69(dt，J＝12.7，7.4Hz，1H)，5.91(d，J＝6.2Hz，1H)，6.25(d，J＝12.8Hz，1H)。

(6) Synthesis of 4-nonyl tridecane

The compound (0.33g, 0.97mmol) obtained in production example 7- (5) was dissolved in THF (2.0m L) at room temperature, and 1N hydrochloric acid (2.95m L, 2.95mmol) was added, and heated at 70 ℃.

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.0Hz，7H)，1.20-1.34(m，39H)，1.44(s，1H)，1.54-1.62(m，3H)，2.37-2.43(m，2H)，9.78(t，J＝1.8Hz，1H)。

(7) Synthesis of 4-nonyltridec-1-ol

The compound (0.28g, 0.88mmol) obtained in production example 7- (6) was dissolved in ethanol (13m L) at 0 ℃, and sodium borohydride (0.13g, 3.50mmol) was added thereto.1.5 hours later, a saturated aqueous ammonium chloride solution was added, and extraction was performed with dichloromethane.

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.0Hz，6H)，1.20-1.33(m，37H)，1.44(s，1H)，1.49-1.65(m，3H)，3.63(t，J＝6.8Hz，2H)。

[ production example 8]

Synthesis of benzyl 5-bromovalerate

According to the method in production example 6, the title compound (5.39g, 19.89mmol) was obtained from 5-bromovaleric acid (4.0g, 22.1mmol), benzyl alcohol (2.3m L, 22.1mmol), dichloromethane (110m L), oxalyl chloride (2.0m L, 23.2mmol) and DMF (0.17m L, 2.21 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：1.62(s，1H)，1.79-1.85(m，2H)，1.88-1.93(m，2H)，2.41(t，J＝7.3Hz，2H)，3.41(t，J＝6.6Hz，2H)，5.14(s，2H)，7.33-7.40(m，5H)。

[ production example 9]

Synthesis of 3-hexylnonane-1-ol

(1) Synthesis of methyl 3-hexylnonanoate

According to the method in production example 4- (2), the title compound (4.18g, 16.27mmol) was obtained from (E) -methyl 2-nonenoate (3.6M L, 18.92mmol), copper (I) bromide (0.275g, 1.92mmol), lithium chloride (0.160g, 3.76mmol), chlorotrimethylsilane (2.7M L, 21.27mmol), hexylmagnesium bromide-THF solution (2.0M, 10.5M L, 21.0mmol) and THF (50M L).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.86-0.91(m，7H)，1.12-1.37(m，25H)，1.79-1.87(m，1H)，2.23(d，J＝6.8Hz，2H)，3.66(s，3H)。

(2) Synthesis of 3-hexylnonane-1-ol

The title compound (2, 33g, 10.14mmol) was obtained according to the method in production example 4- (3) from the compound (4.0g, 15.6mmol) obtained in production example 9- (1), L AH-THF solution (2.4M, 13.0M L, 31.2mmol) and THF (60M L).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.88(t，J＝7.0Hz，6H)，1.13(br s，1H)，1.19-1.34(m，20H)，1.41(br s，1H)，1.49-1.57(m，4H)，3.66(br d，J＝5.5Hz，2H)。

[ production example 10]

Synthesis of benzyl 8-bromooctanoate

According to the method in production example 1, benzyl alcohol (1.3m L, 12.5mmol), 8-bromooctanoic acid (3.06g, 12.73mmol) and DMAP (0.15g, 1.25mmol) were dissolved in dichloromethane (60m L), EDC · HCl (2.99g, 15.61mmol) was added thereto under ice-cooling, and the mixture was stirred at room temperature for 2 hours, a saturated aqueous sodium bicarbonate solution was added to the reaction mixture, and extracted with diethyl ether, the organic phase was washed with a saturated sodium chloride solution and dried over anhydrous magnesium sulfate, after filtration, the solvent was removed by distillation under reduced pressure, and the residue was purified by silica gel column chromatography (n-heptane/ethyl acetate) to obtain the title compound (3.91g, 12.5 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：1.22-1.48(m，6H)，1.58-1.71(m，2H)，1.78-1.90(m，2H)，2.30-2.38(m，2H)，3.33-3.45(m，2H)，5.12(s，2H)，7.28-7.44(m，5H)。

< Synthesis of cationic lipid (1) >

[ example-A-1 ]

Synthesis of (3S) -2- { 9-oxo-9- [ (3-pentyloctyl) oxy ] nonyl } dodecyl 1-methylpyrrolidine-3-carboxylate (cationic lipid 1)

(1) Synthesis of 9-benzyl-1, 1-di-tert-butyl-nonane-1, 1, 9-tricarboxylate

Sodium hydride (60%, 0.43g, 10.85mmol) was suspended in DMF (40m L), di-tert-butyl malonate (2.2m L, 9.87mmol) was gradually added thereto under ice-cooling, and the mixture was stirred for 5 minutes and stirred for 20 minutes after removing the cooling bath under ice-cooling, sodium iodide (0.44g, 2.96mmol) and the compound obtained in production example 1 (3.39g, 10.36mmol) were sequentially added under ice-cooling, and stirred at room temperature for 15 hours.

¹H-NMR(600MHz，CDCl₃)(ppm)：1.25-1.33(m，9H)，1.36(s，1H)，1.39(s，1H)，1.44-1.49(m，16H)，1.56-1.67(m，3H)，1.79(q，J＝6.7Hz，2H)，2.35(t，J＝7.5Hz，2H)，3.11(t，J＝7.7Hz，1H)，5.12(s，2H)，7.32-7.39(m，5H)。

(2) Synthesis of 1-benzyl 9, 9-di-tert-butyloctadecane-1, 9, 9-tricarboxylate

The compound (3.6g, 7.78mmol) obtained in example a-1- (1) was dissolved in DMF (36m L), to which was added 60% sodium hydride (0.47g, 11.67mmol) under water cooling, and the mixture was stirred for 10 minutes, and then stirred at room temperature for 20 minutes, 1-iodotetradecane (3.3m L, 15.56mmol) was added, and the mixture was stirred at room temperature for 4 hours, the reaction mixture was cooled in an ice water bath, a saturated aqueous ammonium chloride solution was added, and extracted with n-heptane, the organic phase was washed with a saturated sodium chloride solution and dried over anhydrous magnesium sulfate, after filtration, the solvent was removed by distillation under reduced pressure, and the residue was purified by silica gel column chromatography (n-heptane/ethyl acetate) to obtain the title compound (3.4g, 5.64 mmol).

¹H-NMR(400MHz，CDCl₃)(ppm)：0.83-0.93(m，3H)，1.05-1.36(m，26H)，1.44(s，18H)，1.57-1.68(m，2H)，1.71-1.82(m，4H)，2.29-2.39(m，2H)，5.11(s，2H)，7.28-7.42(m，5H)。

(3) Synthesis of 2- [9- (benzyloxy) -9-oxononyl ] dodecanoic acid

The compound (3.4g, 5.64mmol) obtained in example A-1- (2) was dissolved in dichloromethane (11.2m L), TFA (5.6m L) was added dropwise thereto under ice-cooling and the mixture was stirred at room temperature for 1.5 hours, toluene was added to the reaction mixture and the solvent was removed by distillation under reduced pressure, the residue was dried by repeating the addition and removing toluene by distillation twice to obtain a crude product of 2- {9- [ (2-butyloctyl) oxy ] -9-oxononyl } -2-decylmanoic acid, the obtained crude product was dissolved in xylene (12m L) and stirred at 150 ℃ for 8 hours, the reaction mixture was cooled to room temperature and concentrated under reduced pressure, the obtained residue was purified by column chromatography (n-heptane/ethyl acetate) to obtain the title compound (2.26g, 5.06 mmol).

¹H-NMR(400MHz，CDCl₃)(ppm)：0.81-0.95(m，3H)，1.18-1.37(m，26H)，1.39-1.52(m，2H)，1.54-1.69(m，4H)，2.28-2.41(m，3H)，5.11(s，2H)，7.28-7.40(m，5H)。

(4) Synthesis of 10- (hydroxymethyl) eicosanoic acid benzyl ester

The compound (2.2g, 4.93mmol) obtained in example a-1- (3) was dissolved in THF (25m L), borane-THF complex (0.92, 8.0m L, 7.39mmol) was added dropwise thereto at-15 ℃ and the mixture was stirred at 0 ℃ for 2 hours, saturated aqueous sodium bicarbonate was added, and the mixture was stirred at room temperature for 5 minutes and extracted with ethyl acetate.

¹H-NMR(400MHz，CDCl₃)(ppm)：0.81-0.95(m，3H)，1.12-1.38(m，31H)，1.39-1.50(m，1H)，1.58-1.72(m，2H)，2.23-2.36(m，2H)，3.48-3.59(m，2H)，5.11(s，2H)，7.28-7.41(m，5H)。

(5) Synthesis of benzyl 10- { [ (tert-butyldimethylsilyl) oxy ] methyl } eicosanoate

The compound (700mg, 1.62mmol) obtained in example a-1- (4) was dissolved in DMF (3.2m L) and imidazole (165mg, 2.43mmol) was added thereto and allowed to dissolve at room temperature under ice cooling, tert-butyldimethylchlorosilane (293mg, 1.94mmol) was added and the mixture was stirred at room temperature for 3 hours, water was added to the reaction mixture and then extracted with diethyl ether, the organic phase was washed with a saturated sodium chloride solution and dried over anhydrous magnesium sulfate, after filtration, the solvent was removed by distillation under reduced pressure, and the residue was purified by silica gel column chromatography (n-heptane/ethyl acetate) to obtain the title compound (810mg, 1.48 mmol).

¹H-NMR(400MHz，CDCl₃)(ppm)：0.02(s，6H)，0.77-0.97(m，12H)，1.06-1.47(m，31H)，1.64(br.s，2H)，2.35(t，J＝7.5Hz，2H)，3.45(d，J＝5.7Hz，2H)，5.11(s，2H)，7.27-7.42(m，5H)。

(6) Synthesis of 3-pentyloctyl 10- { [ (tert-butyldimethylsilyl) oxy ] methyl } eicosane ester

The compound (810mg, 1.48mmol) obtained in example a-1- (5) was dissolved in ethyl acetate (10m L), 10% palladium-carbon (158mg, containing 50% water) was added thereto at room temperature, and the mixture was stirred under normal pressure for 4.5 hours under a hydrogen atmosphere.

The obtained carboxylic acid, 3-pentyloctan-1-ol (CAS 1443519-63-8) (416mg, 2.08mmol) and DMAP (36mg, 0.30mmol) were dissolved in dichloromethane (7.4m L), EDC. HCl (341mg, 1.78mmol) was added thereto under ice-cooling, and the mixture was stirred at room temperature for 16 hours.

¹H-NMR(400MHz，CDCl₃)(ppm)：0.02(s，5H)，0.88(s，17H)，1.12-1.46(m，46H)，1.55(s，8H)，2.21-2.34(m，2H)，3.39-3.52(m，2H)，4.00-4.13(m，2H)。

(7) Synthesis of 3-pentyloctyl 10- (hydroxymethyl) eicosane ester

The compound (925mg, 1.45mmol) obtained in example a-1- (6) was dissolved in THF (4.5M L), a TBAF/THF solution (1M, 3.6M L) was gradually added thereto under ice-cooling, and the mixture was stirred at room temperature for 1 hour, water was added to the reaction mixture and extracted with ethyl acetate, the organic phase was washed with a saturated sodium chloride solution and dried over anhydrous magnesium sulfate, after filtration, the solvent was removed by distillation under reduced pressure, and the residue was purified by silica gel column chromatography (n-heptane/ethyl acetate) to obtain the title compound (584mg, 1.11 mmol).

¹H-NMR(400MHz，CDCl₃)(ppm)：0.78-0.99(m，9H)，1.26(d，J＝2.9Hz，55H)，1.50-1.75(m，8H)，2.28(t，J＝7.6Hz，2H)，3.53(s，2H)，4.08(t，J＝7.0Hz，2H)。

(8) Synthesis of (3S) -2- { 9-oxo-9- [ (3-pentyloctyl) oxy ] nonyl } dodecyl 1-methylpyrrolidine-3-carboxylate

The compound (50mg, 0.095mmol) obtained in example a-1- (7), DIPEA (0.036m L, 0.21mmol), (3S) -1-methylpyrrolidine-3-carboxylic acid hydrochloride (32mg, 0.19mmol) and DMAP (2.3mg, 0.019mmol) were dissolved in dichloromethane (0.8m L), EDC · HCl (40mg, 0.21mmol) was added thereto under ice-cooling, and the mixture was stirred at room temperature for 15 hours, a saturated aqueous sodium bicarbonate solution was added to the reaction mixture and extracted with ethyl acetate, the organic phase was washed with a saturated sodium chloride solution and dried over anhydrous magnesium sulfate, after filtration, the solvent was removed by distillation under reduced pressure, the residue was purified by silica gel column chromatography (n-heptane/ethyl acetate/methanol) to obtain the title compound (47mg, 0.074 mmol).

¹H-NMR(400MHz，CDCl₃)(ppm)：0.82-0.96(m，9H)，1.14-1.48(m，49H)，1.51-1.73(m，4H)，2.03-2.16(m，2H)，2.28(t，J＝7.5Hz，2H)，2.35(s，3H)，2.49(d，J＝9.0Hz，1H)，2.58-2.71(m，2H)，2.76-2.92(m，1H)，2.97-3.12(m，1H)，3.98(d，J＝5.7Hz，2H)，4.08(s，2H)。

< Synthesis of cationic lipid (2) >

[ example-A-2 ]

Synthesis of (3R) -2- { 9-oxo-9- [ (3-pentyloctyl) oxy ] nonyl } dodecyl 1-methylpyrrolidine-3-carboxylate (cationic lipid 2)

(1) Synthesis of (3R) -1-tert-butyl 3- (2- { 9-oxo-9- [ (3-pentyloctyl) oxy ] nonyl } dodecyl) pyrrolidine-1, 3-dicarboxylic acid ester

According to the method in example A-1- (8), the title compound (80mg, 0.11mmol) was obtained from the compound obtained in example A-1- (7) (60mg, 0.11mmol), (R) -1- (tert-butoxycarbonyl) pyrrolidine-3-carboxylic acid (49mg, 0.23mmol), EDC. HCl (48mg, 0.25mmol 1), DIPEA (0.039m L, 0.23mmol), DMAP (2.8mg, 0.023mmol) and dichloromethane (0.80m L).

¹H-NMR(400MHz，CDCl₃)(ppm)：0.88(t，J＝7.0Hz，9H)，1.10-1.38(m，53H)，1.46(s，9H)，1.50-1.72(m，4H)，1.99-2.19(m，2H)，2.28(s，2H)，2.90-3.17(m，1H)，3.24-3.75(m，4H)，3.97-4.03(m，2H)，4.05-4.12(m，2H)。

(2) Synthesis of (3R) -2- { 9-oxo-9- [ (3-pentyloctyl) oxy ] nonyl } dodecyl 1-methylpyrrolidine-3-carboxylate

The compound (80mg, 0.11mmol) obtained in example a-2- (1) was dissolved in dichloromethane (2.2m L), TFA (1.1m L) was added dropwise thereto at room temperature and the mixture was stirred for 0.5 hours, toluene was added to the reaction mixture and the solvent was removed by distillation under reduced pressure, the residue was dissolved in dichloromethane (1m L), a formaldehyde solution (37%, 0.25m L, 3.3mmol) and sodium sulfate (0.79g, 5.54mmol) were added thereto at room temperature, and the mixture was stirred for 10 minutes, sodium tris (acetoxy) borohydride (117mg, 0.55mmol) was added, and the mixture was stirred for 16 hours at room temperature, a saturated aqueous sodium bicarbonate solution was added to the reaction mixture and extracted with chloroform, the organic phase was washed with a saturated sodium chloride solution and dried over anhydrous magnesium sulfate, the silica gel column was filtered, the solvent was removed by distillation under reduced pressure, the residue was purified by chromatography (ethyl acetate/methanol) to obtain the title compound (20mg, 0.031).

¹H-NMR(400MHz，CDCl₃)(ppm)：0.82-0.96(m，9H)，1.14-1.48(m，49H)，1.51-1.73(m，4H)，2.03-2.16(m，2H)，2.23-2.32(m，2H)，，2.35(s，3H)，2.49(d，J＝9.0 Hz，1H)，2.58-2.71(m，2H)，2.76-2.92(m，1H)，2.97-3.12(m，1H)，3.98(d，J＝5.7Hz，2H)，4.04-4.12(m，2H)。

< Synthesis of cationic lipid (3) >

[ example A-3]

Synthesis of 2- { 9-oxo-9- [ (3-pentyloctyl) oxy ] nonyl } dodecyl 1-methylpyrrolidine-3-carboxylate (cationic lipid 3)

(1) Synthesis of 2- [9- (benzyloxy) -9-oxononyl ] dodecyl 1-methylpyrrolidine-3-carboxylate

The compound obtained in example a-1- (4) (0.20g, 0.46mmol), DIPEA (0.161m L, 0.92mmol), and 1-methylpyrrolidine-3-carboxylic acid hydrochloride (0.15mg, 0.92mmol) were dissolved in dichloromethane (2.0m L), EDC · HCl (0.19g, 1.02mmol) was added thereto, and the mixture was stirred at room temperature for 18 hours, the reaction mixture was concentrated under reduced pressure, and then the residue was purified by silica gel column chromatography (ethyl acetate/methanol) to obtain the title compound (0.15g, 0.28 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.0Hz，3H)，1.27(s，40H)，1.61-1.67(m，3H)，1.74-1.86(m，1H)，2.07-2.13(m，2H)，2.34-2.38(m，6H)，2.47-2.52(m，1H)，2.61-2.66(m，2H)，2.85(t，J＝8.8Hz，1H)，3.02-3.07(m，1H)，3.99(d，J＝5.9Hz，2H)，5.08(s，1H)，5.12(s，2H)，7.31-7.38(m，5H)。

(2) Synthesis of 2- { 9-oxo-9- [ (4-pentylnonyl) oxy ] nonyl } dodecyl 1-methylpyrrolidine-3-carboxylate

According to example A-1- (6), a crude carboxylic acid product was obtained from the compound obtained in example A-3- (1) (0.15g, 0.28mmol), 10% palladium on carbon (0.30g, containing 50% water) and ethyl acetate (5m L).

The title compound (0.081g, 0.14mmol) was obtained from the obtained carboxylic acid, the compound (0.048g, 0.23mmol) obtained in production example 2- (4), EDC. HCl (0.086g, 0.45mmol), DMAP (0.005g, 0.05mmol) and dichloromethane (1.0m L).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.86-0.91(m，9H)，1.20-1.33(m，54H)，1.56-1.65(m，5H)，2.05-2.14(m，2H)，2.29(t，J＝7.7Hz，2H)，2.36(s，3H)，2.50(q，J＝7.7Hz，1H)，2.60-2.67(m，2H)，2.86(t，J＝8.8Hz，1H)，3.01-3.07(m，1H)，3.99(d，J＝5.9Hz，2H)，4.05(t，J＝6.8Hz，2H)，4.52(d，J＝4.8Hz，1H)，5.30(s，1H)，5.40(br d，J＝4.0Hz，1H)，5.47-5.53(m，1H)。

< Synthesis of cationic lipid (4) >

[ examples A-4]

Synthesis of 2-nonyl-11-oxo-11- [ (3-pentyloctyl) oxy ] undecyl 1-methylpyrrolidine-3-carboxylate (cationic lipid 4)

(1) Synthesis of 1, 1-di-tert-butyl 9- (3-pentyloctyl) nonane-1, 1, 9-tricarboxylate

Di-tert-butyl malonate (1.20g, 5.56mmol) was dissolved in THF (26m L), 60% sodium hydride (0.22g, 5.56mmol) was added thereto under ice-cooling, and the mixture was stirred for 15 minutes, the mixture was stirred at room temperature for 10 minutes, and then a solution of the compound (2.22g, 5.29mmol) obtained in production example 3 in THF (3m L) was added, the mixture was stirred at room temperature for 18 hours, water was added and extracted with diethyl ether, the organic phase was washed with a saturated sodium chloride solution and dried over anhydrous magnesium sulfate, after filtration, the solvent was removed by distillation under reduced pressure, and the residue was purified by silica gel column chromatography (cyclohexane/diethyl ether) to obtain the title compound (1.79g, 3.39 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.2Hz，6H)，1.26(br s，12H)，1.27-1.34(m，13H)，1.46(s，13H)，1.48(s，8H)，1.54-1.64(m，5H)，1.79(br d，J＝7.0Hz，2H)，2.28(t，J＝7.5Hz，2H)，3.11(t，J＝7.7Hz，1H)，3.19(s，1H)，3.41(s，1H)，4.08(t，J＝7.2Hz，2H)。

(2) Synthesis of 9, 9-di-tert-butyl 1- (3-pentyloctyl) octadecane-1, 9, 9-tricarboxylate

The compound (0.96g, 1.72mmol) obtained in example A-4- (1) was dissolved in THF (7.6m L), to which was added 60% sodium hydride (0.076g, 1.89mmol) under ice-cooling and the mixture was stirred for 20 minutes, after stirring at room temperature for 20 minutes, a solution of 1-iodononane (0.44g, 1.72mmol) in THF (2m L) was added, after refluxing under heat for 6 hours, water was added and extracted with diethyl ether, the organic phase was washed with a saturated sodium chloride solution and dried over anhydrous magnesium sulfate, after filtration, the solvent was removed by distillation under reduced pressure, and the residue was purified by silica gel column chromatography (cyclohexane/diethyl ether) to obtain the title compound (0.59g, 0.86 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.83-0.94(m，12H)，1.13(brs，6H)，1.27(br d，J＝16.5Hz，43H)，1.31-1.36(m，4H)，1.41-1.48(m，28H)，1.51-1.65(m，5H)，1.70-1.85(m，6H)，2.22-2.34(m，2H)，4.02-4.15(m，2H)。

(3) Synthesis of 2-nonyl-11-oxo-11- [ (3-pentyloctyl) oxy ] undecanoic acid

The title compound (0.18g, 0.35mmol) was obtained according to the method in example A-1- (3) from the compound obtained in example A-4- (2) (0.59g, 0.86mmol), dichloromethane (2m L), TFA (1m L) and xylene (2m L).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.84-0.92(m，9H)，1.17-1.33(m，42H)，1.36-1.51(m，4H)，1.54-1.66(m，6H)，2.24-2.37(m，3H)，4.09(t，J＝7.2Hz，2H)。

(4) Synthesis of 3-pentyloctyl 10- (hydroxymethyl) nonadecanoate

The title compound (0, 068g, 0.14mmol) was obtained from the compound (0.093g, 0.18mmol) obtained in example A-4- (3), borane-THF complex (1M, 0.35M L, 0.35mmol), borane-THF complex (1M, 0.53M L, 0.53mmol) and THF (2.0M L) according to the method in production example 2- (1).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.87-0.90(m，10H)，1.27(br dd，J＝11.4，7.3Hz，52H)，1.40-1.46(m，7H)，1.56-1.63(m，4H)，2.28(t，J＝7.5Hz，2H)，3.53(d，J＝5.5Hz，2H)，4.08(t，J＝7.2Hz，2H)。

(5) Synthesis of 2-nonyl-11-oxo-11- [ (3-pentyloctyl) oxy ] undecyl 1-methylpyrrolidine-3-carboxylate

The compound obtained in example A-4- (4) (0.069g, 0.13mmol), DIPEA (0.047m L, 0.27mmol), 1-methylpyrrolidine-3-carboxylic acid hydrochloride (0.044g, 0.27mmol) and DMAP (3mg, 0.03mmol) were dissolved in dichloromethane (1m L) and THF (1m L), EDC. HCl (0.057g, 0.30mmol) was added thereto, and the mixture was stirred at room temperature for 18 hours, the reaction mixture was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (ethyl acetate/methanol) to obtain the title compound (0.046mg, 0.072 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.0Hz，3H)，0.89(t，J＝7.2Hz，6H)，1.19-1.33(m，46H)，1.41(br s，1H)，1.58(q，J＝7.0Hz，2H)，1.60-1.66(m，3H)，1.70(br s，1H)，2.07-2.17(m，2H)，2.29(t，J＝7.5Hz，2H)，2.36(s，3H)，2.50(q，J＝8.0Hz，1H)，2.58-2.69(m，2H)，2.85(t，J＝9.0Hz，1H)，3.05(tt，J＝8.8，6.7Hz，1H)，3.99(d，J＝5.9Hz，2H)，4.09(t，J＝7.2Hz，2H)。

< Synthesis of cationic lipid (5) >

[ example A-5]

Synthesis of 2- {6- [ (3-octylundecyl) oxy ] -6-oxohexyl } dodecyl 1-methylpyrrolidine-3-carboxylate (cationic lipid 5)

(1) Synthesis of 1, 1-di-tert-butyl 6- (3-octylundecyl) hexane-1, 1, 6-tricarboxylate

Sodium hydride (60%, 0.43g, 10.62mmol) was suspended in THF (21m L), di-tert-butyl malonate (2.4m L, 10.6mmol) was added dropwise thereto under ice-cooling, the mixture was heated to room temperature over 30 minutes, the compound obtained in production example 5 (4.67g, 10.12mmol) and sodium iodide (0.15g, 1.01mmol) were added under ice-cooling, and stirred at room temperature for 18 hours, water was added to the reaction mixture and extracted with diethyl ether, the organic phase was washed with a saturated sodium chloride solution and dried over anhydrous magnesium sulfate, after filtration, the solvent was removed by distillation under reduced pressure, and the residue was purified by silica gel column chromatography (cyclohexane/diethyl ether) to obtain the title compound (2.9g, 5.10 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.88(t，J＝7.0Hz，6H)，1.19-1.31(m，31H)，1.31-1.36(m，5H)，1.41-1.51(m，26H)，1.55-1.58(m，2H)，1.59-1.67(m，2H)，1.79(q，J＝7.3Hz，2H)，2.27(t，J＝7.5Hz，2H)，3.10(t，J＝7.5Hz，1H)，4.07(t，J＝7.2Hz，2H)。

(2) Synthesis of 6, 6-di-tert-butyl 1- (3-octylundecyl) hexadecane-1, 6, 6-tricarboxylate

According to the method in example A-4- (2), the title compound (0.99mg, 1.32mmol) was obtained from the compound obtained in example A-5- (1) (2.25mg, 3.78mmol), 1-iodotetradecane (1.0g, 3.78mmol), 60% sodium hydride (0.17g, 4.15mmol) and THF (16.7m L).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.01(s，1H)，0.89(td，J＝7.1，2.8Hz，9H)，1.06-1.23(m，6H)，1.26(br d，J＝7.0Hz，34H)，1.30-1.37(m，5H)，1.40(br s，1H)，1.42-1.49(m，18H)，1.52-1.65(m，6H)，1.71-1.85(m，4H)，2.28(t，J＝7.5Hz，2H)，4.08(t，J＝7.2Hz，2H)。

(3) Synthesis of 2- {6- [ (3-octylundecyl) oxy ] -6-oxohexyl } dodecanoic acid

The crude product of dicarboxylic acid (1.01g) was obtained from the compound (0.99g, 1.34mmol) obtained in example A-5- (2), dichloromethane (3m L) and TFA (1.4m L) according to the procedure in example A-1- (3). the title compound (0.31g, 0.55mmol) was obtained from the crude product (0.84g) obtained and xylene (3m L).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.0Hz，11H)，1.23-1.36(m，60H)，1.40(br s，1H)，1.48(br dd，J＝13.8，6.1Hz，2H)，1.56-1.66(m，7H)，2.29(t，J＝7.5Hz，2H)，2.33-2.36(m，1H)，4.09(t，J＝7.2Hz，2H)。

(4) Synthesis of 3-octylundecyl 7- (hydroxymethyl) heptadecanoate

According to the method in production example 2- (1), the title compound (0.19g, 0.33mmol) was obtained from the compound (0.31g, 0.54mmol) obtained in example A-5- (3), borane-THF complex (1M, 1.1M L, 1.1mmol) and THF (6.0M L).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.0Hz，10H)，1.22-1.37(m，55H)，1.40(br s，1H)，1.43-1.47(m，1H)，1.57(q，J＝6.6Hz，3H)，1.61-1.70(m，2H)，2.29(t，J＝7.5Hz，2H)，3.54(d，J＝5.5Hz，2H)，4.09(t，J＝7.2Hz，2H)。

(5) Synthesis of 2- {6- [ (3-octylundecyl) oxy ] -6-oxohexyl } dodecyl 1-methylpyrrolidine-3-carboxylate

According to the method in example A-4- (5), the title compound (0.055g, 0.083mmol) was obtained from the compound obtained in example A-5- (4) (0.19mg, 0.33mmol), 1-methylpyrrolidine-3-carboxylic acid hydrochloride (0.11g, 0.67mmol), EDC. HCl (0.14g, 0.73mmol), DIPEA (0.116m L, 0.67mmol), DMAP (8mg, 0.07mmol) and dichloromethane (1.5m L).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.0Hz，9H)，1.20-1.34(m，53H)，1.40(br s，1H)，1.57(q，J＝6.8Hz，2H)，1.61-1.66(m，3H)，2.05-2.17(m，2H)，2.29(t，J＝7.5Hz，2H)，2.37(s，3H)，2.45-2.56(m，1H)，2.64(dd，J＝9.5，7.0Hz，1H)，2.68(dt，J＝9.1，6.5Hz，1H)，2.90(t，J＝8.8Hz，1H)，3.06(quin，J＝7.8Hz，1H)，3.99(d，J＝5.9Hz，2H)，4.08(t，J＝7.2Hz，2H)。

< Synthesis of cationic lipid (6) >

[ example A-6]

Synthesis of 2- {4- [ (4-nonyltridecyl) oxy ] -4-oxobutyl } dodecyl 1-methylpyrrolidine-3-carboxylate (cationic lipid 6)

(1) Synthesis of 4-benzyl-1, 1-di-tert-butyl-butane-1, 1, 4-tricarboxylate

The title compound (2.93g, 7.46mmol) was obtained according to the method in example A-4- (1) from di-tert-butyl malonate (2.65g, 12.25mmol), THF (58m L), 60% sodium hydride (0.49g, 12.25mmol) and the compound obtained in production example 6 (3.00g, 11.67 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：1.43-1.48(m，20H)，1.66-1.72(m，2H)，1.82-1.86(m，2H)，2.40(t，J＝7.5Hz，2H)，3.13(t，J＝7.5Hz，1H)，5.12(s，2H)，7.31-7.38(m，5H)。

(2) Synthesis of 1-benzyl 4, 4-di-tert-butyltetradecane-1, 4, 4-tricarboxylate

The compound (2.93g, 7.46mmol) obtained in example A-6- (1) was dissolved in THF (38m L), to which was added 60% sodium hydride (0.31g, 7.83mmol) under ice-cooling, and the mixture was stirred for 1 hour, a solution of 1-iodotetradecane (2.10g, 7.83mmol) in THF (5m L) was added, and refluxed overnight under heating, water was added and extracted with diethyl ether, the organic phase was washed with a saturated sodium chloride solution and dried over anhydrous magnesium sulfate, after filtration, the solvent was removed by distillation under reduced pressure, and the residue was purified by silica gel column chromatography (cyclohexane/diethyl ether) to obtain the title compound (2.59g, 4.85 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.2Hz，3H)，1.09-1.20(m，2H)，1.22-1.33(m，15H)，1.45(s，18H)，1.48-1.56(m，2H)，1.59(s，1H)，1.76-1.84(m，4H)，2.37(t，J＝7.3Hz，2H)，5.12(s，2H)，7.32-7.38(m，5H)。

(3) Synthesis of 2- [4- (benzyloxy) -4-oxobutyl ] dodecanoic acid

The crude product of dicarboxylic acid (2.34g) was obtained from the compound obtained in example A-6- (2) (2.59g, 4.87mmol), dichloromethane (11m L) and TFA (5m L) according to the procedure in example A-1- (3). the title compound (1.58g, 4.21mmol) was obtained from the crude product obtained (2.05g) and xylene (11m L).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.0Hz，3H)，1.07-1.22(m，1H)，1.24-1.32(m，16H)，1.41-1.57(m，2H)，1.60-1.74(m，4H)，2.34-2.41(m，3H)，5.10-5.15(m，2H)，7.31-7.40(m，5H)。

(4) Synthesis of 2- {4- [ (4-nonyltridecyl) oxy ] -4-oxobutyl } dodecyl 1-methylpyrrolidine-3-carboxylate

The title compound (1, 29g, 3.54mmol) was obtained from the compound obtained in example A-6- (3) (1.58g, 4.21mmol), borane-THF complex (1M, 8.4M L, 8.4mmol) and THF (48M L) according to the method in production example 2- (1).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.0Hz，3H)，1.24-1.34(m，22H)，1.35-1.42(m，2H)，1.46-1.50(m，1H)，1.67(quin，J＝7.7Hz，3H)，2.36-2.39(m，2H)，3.51-3.58(m，2H)，5.13(s，2H)，7.32-7.39(m，5H)。

(5) Synthesis of 2- [4- (benzyloxy) -4-oxobutyl ] dodecyl 1-methylpyrrolidine-3-formate

According to the method in example A-4- (5), the title compound (0.33g, 0.71mmol) was obtained from the compound obtained in example A-6- (4) (0.50g, 1.4mmol), 1-methylpyrrolidine-3-carboxylic acid hydrochloride (0.46g, 2.76mmol), EDC. HCl (0.58g, 3.03mmol), DIPEA (0.48m L, 2.76mmol), DMAP (34mg, 0.28mmol) and dichloromethane (2m L).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.88(t，J＝7.0Hz，3H)，1.23-1.36(m，23H)，1.42(s，5H)，1.63-1.69(m，3H)，1.85(dt，J＝6.3，3.3Hz，1H)，2.06-2.11(m，2H)，2.33-2.36(m，6H)，2.49(q，J＝7.7Hz，1H)，2.59-2.64(m，2H)，2.82(t，J＝8.8Hz，1H)，2.94(s，1H)，3.02(br t，J＝8.3Hz，1H)，3.74(br t，J＝6.2Hz，1H)，3.96-4.00(m，2H)，5.11(s，2H)，7.31-7.37(m，5H)。

(6) Synthesis of 2- {4- [ (4-nonyltridecyl) oxy ] -4-oxobutyl } dodecyl 1-methylpyrrolidine-3-carboxylate

According to example A-1- (6), the crude product of carboxylic acid (0.15g) was obtained from the compound obtained in example A-6- (5) (0.18g, 0.37mmol), 10% palladium on carbon (0.20g, containing 50% water) and ethyl acetate (9m L).

The title compound (9mg, 0.014mmol) was obtained from the obtained carboxylic acid (0.086g, 0.23mmol), the compound (0.050g, 0.16mmol) obtained in production example 7- (7), EDC. HCl (0.086g, 0.45mmol), DIPEA (0.074m L, 0.45mmol) and dichloromethane (1.0m L).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.89(t，J＝7.0Hz，9H)，1.21-1.37(m，57H)，1.57-1.70(m，7H)，2.06-2.15(m，2H)，2.30(t，J＝7.5Hz，2H)，2.36(s，3H)，2.45-2.57(m，1H)，2.64(ddd，J＝9.4，6.8，2.9Hz，2H)，2.85(t，J＝8.8Hz，1H)，3.00-3.08(m，1H)，3.97-4.07(m，4H)。

< Synthesis of cationic lipid (7) >

[ examples A-7]

Synthesis of bis (3-nonyldidodecyl) 6- { [ (1-methylpyrrolidine-3-carbonyl) oxy ] methyl } undecanedioate (cationic lipid 7)

(1) Synthesis of 5-benzyl-1, 1-di-tert-butylpentane-1, 1, 5-tricarboxylate

The title compound (2.09g, 5.77mmol) was obtained according to the method in example A-4- (1) from di-tert-butyl malonate (2.34g, 10.84mmol), THF (52m L), 60% sodium hydride (0.26g, 10.8mmol) and the compound obtained in production example 8 (2.8g, 10.3 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：1.26-1.41(m，3H)，1.43-1.49(m，20H)，1.55-1.60(m，1H)，1.69(quin，J＝7.6Hz，2H)，1.78-1.86(m，2H)，2.37(t，J＝7.5Hz，2H)，3.11(t，J＝7.5Hz，1H)，5.11(s，2H)，7.31-7.40(m，5H)。

(2) Synthesis of 1, 9-dibenzyl 5, 5-di-tert-butyl nonane-1, 5, 5, 9-tetraformate

The compound (2.09g, 5.14mmol) obtained in example A-7- (1) was dissolved in THF (23m L), to which 60% sodium hydride (0.23g, 5.66mmol) and sodium iodide (0.077g, 0.51mmol) were added in this order at room temperature, and the mixture was stirred for 30 minutes, to the reaction mixture was added a solution of the compound (1.39g, 5.14mmol) obtained in production example 8 in THF (2m L), and heated at 65 ℃ after 3 days, ice water was added and extracted with ether, the organic phase was washed with a saturated sodium chloride solution and dried over anhydrous magnesium sulfate, after filtration, the solvent was removed by distillation under reduced pressure, the residue was purified by silica gel column chromatography (ether/n-pentane) to obtain the title compound (2.27g, 3.80 mmol).

¹H-NMR(600MHz，CDCl₃)(ppm)：1.13-1.20(m，4H)，1.42(s，17H)，1.58-1.70(m，4H)，1.74-1.80(m，4H)，2.35(t，J＝7.6Hz，4H)，5.10(s，4H)，7.29-7.39(m，10H)。

(3) Synthesis of 7- (benzyloxy) -2- [5- (benzyloxy) -5-oxopentyl ] -7-oxopentanoic acid

The crude product of dicarboxylic acid (2.02g) was obtained from the compound obtained in example A-7- (2) (2.27g, 3.80mmol), dichloromethane (9m L) and TFA (4.1m L) according to the procedure in example A-1- (3). the title compound (1.47g, 3.34mmol) was obtained from the crude product obtained and xylene (10m L).

¹H-NMR(600MHz，CDCl₃)(ppm)：1.27-1.41(m，5H)，1.42-1.50(m，6H)，1.59-1.70(m，7H)，2.31-2.40(m，5H)，5.12(s，4H)，7.31-7.38(m，10H)。

(4) Synthesis of 6- (hydroxymethyl) undecanedioic acid dibenzyl ester

The title compound (1, 14g, 2.70mmol) was obtained from the compound obtained in example A-7- (3) (1.47g, 3.33mmol), borane-THF complex (1M, 6.7M L, 6.7mmol) and THF (38M L) according to the method in production example 2- (1).

¹H-NMR(600MHz，CDCl₃)(ppm)：1.24-1.38(m，10H)，1.42-1.47(m，3H)，1.65(quin，J＝7.2Hz，4H)，1.71(br s，1H)，2.37(t，J＝7.5Hz，4H)，3.50(br d，J＝4.0Hz，2H)，5.12(s，4H)，7.31-7.39(m，7H)。

(5) Synthesis of dibenzyl 6- { [ (1-methylpyrrolidine-3-carbonyl) oxy) methyl ] undecanedioate

According to the method in example A-4- (5), the title compound (0.56g, 1.05mmol) was obtained from the compound obtained in example A-7- (4) (1.14g, 2.68mmol), 1-methylpyrrolidone-3-carboxylic acid hydrochloride (0.89g, 5.36mmol), EDC. HCl (1.13g, 5.90mmol), DIPEA (0.93m L, 5.36mmol), DMAP (0.066g, 0.54mmol) and dichloromethane (12m L).

¹H-NMR(600MHz，CDCl₃)(ppm)：1.26-1.38(m，9H)，1.59-1.70(m，5H)，1.81(br s，1H)，2.06-2.14(m，2H)，2.34-2.40(m，7H)，2.47-2.55(m，1H)，2.58-2.68(m，2H)，2.84(t，J＝8.8Hz，1H)，3.04(quin，J＝7.7Hz，1H)，3.98(d，J＝5.9Hz，2H)，5.13(s，4H)，5.32(s，1H)，7.28(s，1H)，7.32-7.40(m，10H)。

(6) Synthesis of bis (3-nonyldidodecyl) 6- { [ (1-methylpyrrolidine-3-carbonyl) oxy) methyl ] undecanedioate

According to example A-1- (6), the crude product of dicarboxylic acid (0.24g) was obtained from the compound obtained in example A-7- (5) (0.56g, 1.03mmol), 10% palladium on carbon (0.55g, containing 50% water) and ethyl acetate (27m L).

The title compound (0.029g, 0.030mmol) was obtained from the obtained carboxylic acid (0.055g, 0.15mmol), the compound (0.096g, 0.31mmol) obtained in production example 7- (3), EDC. HCl (0.118g, 0.62mmol), DIPEA (0.11m L, 0.62mmol), DMAP (4mg, 0.031mmol) and dichloromethane (0.7m L).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.88(t，J＝7.0Hz，13H)，1.12-1.45(m，84H)，1.48-1.70(m，12H)，2.09(q，J＝7.3Hz，2H)，2.28(t，J＝7.6Hz，4H)，2.36(s，3H)，2.45-2.57(m，1H)，2.63(br dd，J＝8.9，6.9Hz，2H)，2.83(br t，J＝8.6Hz，1H)，3.03(quin，J＝7.7Hz，1H)，3.94-4.02(m，2H)，4.07(t，J＝7.2Hz，4H)。

< Synthesis of cationic lipid (8) >

[ examples A-8]

Synthesis of bis (3-pentyloctyl) 9- { [ (1-methylpyrrolidine-4-carbonyl) oxy ] methyl } heptadecanedioate (cationic lipid 8)

(1) Synthesis of 8-benzyl-1, 1-di-tert-butyloctane-1, 1, 8-tricarboxylate

The title compound (1.60g, 3.57mmol) was obtained from di-tert-butyl malonate (1.5m L, 6.70mmol), the compound obtained in production example 10 (2.0g, 6.39mmol), 60% sodium hydride (0.27g, 6.70mmol), sodium iodide (0.096g, 0.64mmol) and THF (60m L) according to the method in example A-5- (1).

¹H-NMR(600MHz，CDCl₃)(ppm)：1.23-1.36(m，8H)，1.45(s，18H)，1.58-1.69(m，2H)，1.72-1.84(m，2H)，2.30-2.40(m，2H)，3.05-3.15(m，1H)，5.11(s，2H)，7.28-7.41(m，5H)。

(2) Synthesis of 1, 15-dibenzyl 8, 8-di-tert-butyl pentadecane-1, 8, 8, 15-tetraformate

The title compound (1.4g, 2.07mmol) was obtained according to the method in example A-7- (2) from the compound obtained in example A-8- (1) (1.6g, 3.57mmol), the compound obtained in production example 10 (1.17g, 3.75mmol), sodium iodide (0.053g, 0.36mmol), 60% sodium hydride (0.16g, 4.0mmol) and THF (15m L).

¹H-NMR(600MHz，CDCl₃)(ppm)：1.03-1.17(m，4H)，1.23-1.36(m，12H)，1.43(s，18H)，1.56-1.68(m，4H)，1.70-1.80(m，4H)，2.29-2.38(m，4H)，5.11(s，4H)，7.27-7.41(m，10H)。

(3) Synthesis of 10- (benzyloxy) -2- [8- (benzyloxy) -8-oxooctyl ] -10-oxododecanoic acid

The crude product of dicarboxylic acid (1.17g) was obtained from the compound obtained in example A-8- (2) (1.40g, 2.06mmol), dichloromethane (10m L) and TFA (2.4m L) according to the procedure in example A-1- (3). the title compound (0.83g, 1.61mmol) was obtained from the crude product obtained and xylene (25m L).

¹H-NMR(600MHz，CDCl₃)(ppm)：1.18-1.37(m，16H)，1.38-1.71(m，8H)，2.26-2.41(m，5H)，5.11(s，4H)，7.28-7.43(m，10H)。

(4) Synthesis of 9- (hydroxymethyl) heptadecanedioic acid dibenzyl ester

The title compound (0, 72g, 1.43mmol) was obtained from the compound obtained in example A-8- (3) (0.83g, 1.59mmol), borane-THF complex (1M, 4.0M L, 4.0mmol) and THF (6.0M L) according to the method in production example 2- (1).

¹H-NMR(600MHz，CDCl₃)(ppm)：1.12-1.51(m，22H)，1.56-1.72(m，4H)，2.29-2.41(m，4H)，3.47-3.58(m，2H)，5.11(s，4H)，7.28-7.44(m，10H)。

(5) Synthesis of dibenzyl 9- { [ (1-methylpyrrolidine-3-carbonyl) oxy) methyl ] heptadecanedioate

The title compound (0.81g, 1.30mmol) was obtained according to the method in example A-4- (5) from the compound obtained in example A-8- (4) (0.73g, 1.43mmol), 1-methylpyrrolidine-3-carboxylic acid hydrochloride (0.36g, 2.14mmol), EDC & HCl (0.438g, 2.29mmol), DIPEA (0.37m L, 2.14mmol), DMAP (0.035g, 0.29mmol) and dichloromethane (6m L).

¹H-NMR(600MHz，CDCl₃)(ppm)：1.13-1.35(m，22H)，1.58-1.69(m，5H)，2.04-2.14(m，2H)，2.29-2.39(m，7H)，2.43-2.54(m，1H)，2.57-2.67(m，2H)，2.84(t，J＝8.8Hz，1H)，2.99-3.08(m，1H)，3.97(d，J＝5.7Hz，2H)，5.11(s，4H)，7.29-7.40(m，9H)。

(6) Synthesis of bis (3-hexylnonyl) 9- { [ (1-methylpyrrolidine-3-carbonyl) oxy) methyl ] heptadecanedioate

According to example A-1- (6), the crude product of dicarboxylic acid (0.66g) was obtained from the compound obtained in example A-8- (5) (0.81g, 1.30mmol), 10% palladium on carbon (0.028g, containing 50% water) and ethyl acetate (15m L).

The title compound (0.077g, 0.090mmol) was obtained from the obtained dicarboxylic acid (0.10g, 0.23mmol), the compound obtained in production example 9- (2) (0.124g, 0.54mmol), EDC. HCl (0.113g, 0.59mmol), DIPEA (0.10m L, 0.59mmol), DMAP (6mg, 0.050mmol) and dichloromethane (5m L).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.88(t，J＝7.0Hz，13H)，1.18-1.35(m，64H)，1.37-1.42(m，2H)，1.52-1.66(m，9H)，2.06-2.13(m，2H)，2.25-2.32(m，4H)，2.36(s，3H)，2.45-2.53(m，1H)，2.59-2.66(m，2H)，2.85(t，J＝8.8Hz，1H)，3.00-3.08(m，1H)，3.98(d，J＝5.9Hz，2H)，4.08(t，J＝7.1Hz，4H)。

< Synthesis of cationic lipid (9) >

[ examples A-9]

Synthesis of bis (3-pentyloctyl) 9- { [ (1-methylpyrrolidine-3-carbonyl) oxy ] methyl } heptadecanedioate (cationic lipid 9)

According to the method in example A-1- (6), the title compound (0.089g, 0.11mmol) was obtained from the dicarboxylic acid (0.10g, 0.23mmol) obtained in example A-8- (6), 3-pentyloctan-1-ol (CAS 1443519-63-8) (0.11g, 0.54mmol), EDC. HCl (0.11g, 0.59mmol), DIPEA (0.10m L, 0.59mmol), DMAP (6mg, 0.050mmol) and dichloromethane (5m L).

¹H-NMR(600MHz，CDCl₃)(ppm)：0.88(t，J＝7.2Hz，13H)，1.17-1.34(m，56H)，1.37-1.43(m，2H)，1.53-1.69(m，10H)，2.06-2.14(m，2H)，2.28(t，J＝7.5Hz，4H)，2.36(s，3H)，2.45-2.53(m，1H)，2.58-2.66(m，2H)，2.84(t，J＝8.9Hz，1H)，3.00-3.08(m，1H)，3.98(d，J＝5.7Hz，2H)，4.08(t，J＝7.1Hz，4H)。

< Synthesis of cationic lipid (10) >

[ comparative example A' -1]

Synthesis of 2- { 9-oxo-9- [ (3-pentyloctyl) oxy ] nonyl } dodecyl 1-methylazepane-4-carboxylate (cationic lipid 10)

(1) Synthesis of 1-tert-butyl 4- (2- { 9-oxo-9- [ (3-pentyloctyl) oxy ] nonyl } dodecyl) azacyclopentane-1, 4-dicarboxylic acid ester

The title compound (81mg, 0.11mmol) was obtained according to the method in example A-1- (8) from the compound obtained in example A-1- (7) (60mg, 0.11mmol), 1- (tert-butoxycarbonyl) azepane-4-carboxylic acid (56mg, 0.23mmol), EDC. HCl (48mg, 0.25mmol), DIPEA (0.039m L, 0.23mmol), DMAP (2.8mg, 0.023mmol) and dichloromethane (0.80m L).

(2) Synthesis of 2- { 9-oxo-9- [ (3-pentyloctyl) oxy ] nonyl } dodecyl 1-methylazepane-4-carboxylate

According to the method in example A-2- (2), the title compound (51mg, 0.077mmol) was obtained from the compound (81mg, 0.11mmol) obtained in comparative example A' -1(1), TFA (1.1m L), THF (1m L), formalin (37%, 0.080m L, 1.1mmol), sodium sulfate (460mg, 3.23mmol) and sodium tris (acetoxy) borohydride (69mg, 0.32 mmol).

¹H-NMR(400MHz，CDCl₃)(ppm)：0.88(t，J＝7.0Hz，9H)，1.14-1.49(m，49H)，1.51-1.71(s，4H)，1.73-2.10(m，5H)，2.23-2.31(m，2H)，2.34(s，3H)，2.45-2.76(m，5H)，3.92-3.98(m，2H)，4.03-4.12(m，2H)。

< Synthesis of cationic lipid (11) >

[ comparative example A' -2]

Synthesis of 2-butyloctyl 9-bromononanoate (cationic lipid 11)

The title compound (30mg, 0.048mmol) was obtained according to the method in example A-1- (8) from the compound obtained in example A-1- (7) (50mg, 0.095mmol), 1-methyl-3-azetidinecarboxylic acid (22mg, 0.19mmol), EDC. HCl (40mg, 0.21mmol), DIPEA (0.033m L, 0.19mmol), DMAP (2.3mg, 0.019mmol) and dichloromethane (0.80m L).

¹H-NMR(400MHz，CDCl₃)(ppm)：0.88(t，J＝6.9Hz，9H)，1.14-1.47(m，44H)，1.61(s，8H)，2.30(s，5H)，3.26(s，3H)，3.46-3.64(m，2H)，3.99(d，J＝5.9Hz，2H)，4.08(t，J＝7.1Hz，2H)。

Synthetic cationic lipids 1 to 11 are indicated in table a below.

Table a: synthetic cationic lipids 1 to 11

B. Preparation and analysis of the composition

< preparation of composition (1) >

[ example B-1]

Compositions were prepared using the cationic lipid 1 of example A-1. As the nucleic acid, annealed siRNA (gene design inc., hereinafter also referred to as "factor VII siRNA") that silences the factor VII (coagulation factor VII) gene and is composed of a sense strand having a base sequence: 5 ' -ggafufcafufufufufufufufufufufuefct-3 ' (T: DNA, fU, fC ═ 2 ' -fluoro RNA ═ phosphorothioate bond) (SEQ ID NO: 1), and the antisense strand has the base sequence: 5 ' -GfUAAGAffUfUGAGAfUGAfUfCfCT T-3 ' (T: DNA, fU, fC ═ 2 ' -fluoro RNA ═ phosphorothioate bond) (SEQ ID NO: 2).

Factor VII siRNA was dissolved in 25mM sodium acetate aqueous solution (pH 4.0) at a ratio (molar ratio) of 60/8.5/30/1.5 to obtain diluted siRNA solution cationic lipid 1, DSPC (Nippon Fine Chemical co., L td.), cholesterol (japan Fine Chemical co., MPEG2000-DMG (NOF Corporation), methoxy (polyethylene glycol, molecular weight 2000) -dimyristylglycerol) were dissolved in ethanol so that the total lipid concentration was set to 7.2mM, and then lipid solution was obtained, the diluted siRNA solution and lipid solution were fed and mixed at flow rates of 3m L/min and 1m L/min, respectively, to obtain lipid complex aqueous solution, dialysis membrane (product name "Float-a-L yzer G2", spectm (spectm, 100.) was used to obtain dialysis membrane, aqueous solution was sterilized, and the pH of the dialysis membrane was filtered to obtain a liquid complex, pH-1, pH 4, and pH 4 was obtained from the liquid composition.

[ example B-2]

A composition of example B-2 was obtained in the same manner as in example B-1, except that the cationic lipid 2 of example A-2 was used instead of the cationic lipid 1 as the cationic lipid.

[ comparative example B' -1]

The composition of comparative example B '-1 was obtained in the same manner as in example B-1, except that the cationic lipid 10 of comparative example A' -1 was used instead of the cationic lipid 1 as the cationic lipid.

[ comparative example B' -2]

The composition of comparative example B '-2 was obtained in the same manner as in example B-1, except that the cationic lipid 11 of comparative example a' -2 was used instead of the cationic lipid 1 as the cationic lipid.

< analysis of composition (1) >

In the compositions of example B-1, example B-2, comparative example B '-1 and comparative example B' -2, the encapsulation efficiency of siRNA in lipid complexes was measured.

Specifically, the siRNA concentration (a) measured with Quant-iT RiboGreen RNA reagent (Invitrogen) after dilution of the composition with RNase Free water was set to the siRNA concentration present in the external solution of the lipid complex. The siRNA concentration (B) measured after diluting the composition with 1% Triton X-100 was set as the total siRNA concentration in the composition. Then, the encapsulation efficiency of the nucleic acid was calculated according to the following formula (F1).

Encapsulation efficiency (%) ═ 100- (A/B) × 100(F1)

The average particle diameter of the lipid complex was measured using a particle diameter analyzer (product name "Zetasizer Nano ZS", manufactured by malvernpanaceae (malvernpannalytical L td.).

Table 1 shows the encapsulation efficiency of siRNA and the average particle diameter (Z-average) and polydispersity index of the lipid complex.

TABLE 1

It was confirmed that the compositions of examples B-1 and B-2 exhibited high encapsulation efficiency of siRNA, which was the same as that of the compositions of comparative examples B '-1 and B' -2.

< preparation of composition (2) >

[ example B-3]

A composition of example B-3 was obtained in the same manner as in example B-1 in the preparation of composition (1), except that cationic lipid 3 of example A-3 was used as the cationic lipid instead of cationic lipid 1.

[ example B-4]

A composition of example B-4 was obtained in the same manner as example B-3, except that the cationic lipid 4 of example A-4 was used as the cationic lipid instead of the cationic lipid 3.

[ example B-5]

A composition of example B-5 was obtained in the same manner as in example B-3, except that the cationic lipid 5 of example A-5 was used as the cationic lipid instead of the cationic lipid 3.

[ example B-6]

A composition of example B-6 was obtained in the same manner as example B-3, except that the cationic lipid 6 of example A-6 was used as the cationic lipid instead of the cationic lipid 3.

[ example B-7]

A composition of example B-7 was obtained in the same manner as in example B-3, except that the cationic lipid 7 of example A-7 was used as the cationic lipid instead of the cationic lipid 3.

[ example B-8]

A composition of example B-8 was obtained in the same manner as example B-3, except that the cationic lipid 8 of example A-8 was used as the cationic lipid instead of the cationic lipid 3.

[ example B-9]

A composition of example B-9 was obtained in the same manner as example B-3, except that the cationic lipid 9 of example A-9 was used as the cationic lipid instead of the cationic lipid 3.

[ example B-10]

A composition of example B-10 was obtained in the same manner as in example B-3, except that the cationic lipid 1 of example A-1 was used as the cationic lipid instead of the cationic lipid 3.

[ comparative example B' -3]

A composition of comparative example B' -3 was obtained in the same manner as in example B-3, except that bis ((Z) -non-2-en-1-yl) 9- ((4- (dimethylamino) butyryl) oxy) heptadecanedioate (hereinafter also referred to as "a L N-319") (disclosed in patent document 2, synthesized according to the method disclosed in patent document 2) represented by the following formula (i) was used instead of the cationic lipid 3 as the cationic lipid.

< analysis of composition (2) >

The siRNA encapsulation efficiency in the lipid complexes and the average particle size of the lipid complexes of the compositions of examples B-3 to B-10 and comparative example B' -3 were measured in the same manner as the analysis of composition (1). Table 2 shows the encapsulation efficiency of siRNA and the average particle diameter (Z-average) and polydispersity index of the lipid complex.

TABLE 2

< analysis of composition (4) >

The compositions of examples B-3 to B-9 and comparative example B' -3 were further stored in 4 ℃ sealed vials for 1.5 months, and the average particle diameter of the lipid complex (average particle diameter after storage) was measured in the same manner as the analysis of composition (1) — table 3 shows the change in the average particle diameter of the lipid complex (Z-average) — in the table, the change in average particle diameter (%) was calculated by the average particle diameter after storage/average particle diameter before storage × 100.

TABLE 3

It was confirmed that the compositions of examples B-3 to B-9 had almost no change in average particle size after 1.5 months of storage and were physically more stable than the composition of comparative example B' -3. The results show that the cationic lipid of the present invention can minimize the increase in particle size of the lipid complex after storage over a certain period of time.

C. Test examples

[ test example 1]

The compositions of example B-1, example B-2, comparative example B '-1 and comparative example B' -2 were diluted with PBS so that the factor VII siRNA concentration encapsulated in the lipid complex was 3 or 30 μ g/m L the compositions were administered to ICR mice (n ═ 3) via the tail vein at a dose of 10m L/kg and blood was collected under anesthesia 1 day after administration.

When the factor VII protein concentration of the group to which PBS was administered (negative control) was set to 100%, the factor VII protein concentration of the group to which the composition was administered was calculated as a relative value. These results are shown in fig. 1 and table 4.

TABLE 4

It was confirmed that the compositions of examples B-1 and B-2 had a higher inhibitory effect on the expression of factor VII protein than the compositions of comparative examples B '-1 and B' -2. This result demonstrates that the compositions of the examples efficiently release nucleic acids into the cytoplasm.

[ test example 2]

In the same manner as in test example 1, the compositions of examples B-3 to B-10 and comparative example B' -3 were administered to ICR mice (n ═ 3), and the relative values of the factor VII protein concentration in plasma 1 day after the administration were calculated by setting the factor VII protein concentration in the group to which PBS was administered (negative control) to 100%. These results are shown in fig. 2 and table 5.

TABLE 5

The results in examples 1 and 2 were tested to demonstrate that the compositions of the examples can release nucleic acids into the cytoplasm.

The results in examples 1 and 2 were also tested to show that the compositions of examples B-1, B-2, B-3, B-4, B-5, B-6, B-8, B-9 and B-10 (cationic lipids 1, 2, 3, 4, 5, 6, 8 and 9) had excellent inhibition of factor VII protein expression (particularly when siRNA doses were relatively high). From these results, it was confirmed that the composition efficiently released nucleic acid into cytoplasm.

The results in examples 1 and 2 were also tested to show that the compositions of examples B-1, B-2, B-3, B-4, B-5, B-6, B-9 and B-10 (cationic lipids 1, 2, 3, 4, 5, 6 and 9) inhibited factor VII protein expression even at lower siRNA doses. From these results, it was confirmed that the composition efficiently released nucleic acid into cytoplasm.

In particular, the compositions of examples B-1, B-2, B-4, B-6, and B-10 (cationic lipids 1, 2, 4, and 6) had a higher inhibition of factor VII protein expression than the composition of comparative example B' -3. Indicating that these compositions can more efficiently release nucleic acids into the cytoplasm.

In view of the above results, according to the cationic lipid of the present embodiment, it is possible to effectively release nucleic acid into cytoplasm. In addition, according to the cationic lipid of the embodiment of the present invention, it is possible to minimize an increase in particle size of the lipid complex after storage over a certain period of time.

Industrial applicability

According to the present invention, a cationic lipid capable of releasing nucleic acid into the cytoplasm can be provided.