阅读说明：本技术 一种2-氟-5-[(4-氧代-3h-2,3-二氮杂萘基)甲基]苯甲酸的制备方法 (Preparation method of 2-fluoro-5- [ (4-oxo-3H-2, 3-diazanaphthyl) methyl ] benzoic acid ) 是由 陈剑 余长泉 柴金柱 于 2021-03-09 设计创作，主要内容包括：本发明公开了一种2-氟-5-[(4-氧代-3H-2,3-二氮杂萘基)甲基]苯甲酸的制备方法,包括：S1、(3-氧代-1,3-二氢异苯并呋喃-1-基)磷酸二甲酯的制备；S2、2-氟-5-(3-氧代-3H-异苯并呋喃-1-基亚甲基)溴苯的制备；S3、2-氟-5-(3-氧代-3H-异苯并呋喃-1-基亚甲基)苯甲酸甲酯的制备；S4、2-氟-5-[(4-氧代-3H-2,3-二氮杂萘基)甲基]苯甲酸的制备。本发明制备方法操作简便,反应条件温和,中间体易于纯化,总收率比现有技术提高,工业化成本降低。(The invention discloses a preparation method of 2-fluoro-5- [ (4-oxo-3H-2, 3-diazanaphthyl) methyl ] benzoic acid, which comprises the following steps: preparation of S1 and dimethyl (3-oxo-1, 3-dihydroisobenzofuran-1-yl) phosphate; s2, preparation of 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-ylmethylene) bromobenzene; s3, preparing 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-yl methylene) methyl benzoate; s4, preparation of 2-fluoro-5- [ (4-oxo-3H-2, 3-naphthyridinyl) methyl ] benzoic acid. The preparation method has the advantages of simple operation, mild reaction conditions, easy purification of the intermediate, higher total yield than the prior art and lower industrial cost.)

1. A method for preparing 2-fluoro-5- [ (4-oxo-3H-2, 3-diazanaphthyl) methyl ] benzoic acid, which is characterized by comprising the following steps: the method comprises the following steps in sequence:

preparation of S1, dimethyl (3-oxo-1, 3-dihydroisobenzofuran-1-yl) phosphate: mixing and stirring o-carboxybenzaldehyde, triethylamine and dichloromethane, adding dimethyl phosphite, stirring and reacting for 4-5 h at room temperature, adding methanesulfonic acid, stirring for 30min until the reaction is finished, concentrating the reaction solution to be dry, adding water, pulping for 2-3 h, filtering to be dry, and pulping by using petroleum ether to obtain white solid (3-oxo-1, 3-dihydroisobenzofuran-1-yl) dimethyl phosphate;

preparation of S2, 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-ylmethylene) bromobenzene: mixing the (3-oxo-1, 3-dihydroisobenzofuran-1-yl) dimethyl phosphate obtained in the step, 3-bromo-4-fluorobenzaldehyde and dichloromethane, cooling to 6 ℃, dropwise adding triethylamine, reacting at room temperature for 4-5H, concentrating the reaction solution to dryness, adding water, packaging, filtering to dryness, and pulping by using methyl tert-butyl ether to obtain white solid 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-ylmethylene) bromobenzene;

preparation of S3, methyl 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-ylmethylene) benzoate: adding the solid 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-yl methylene) bromobenzene obtained in the step and sodium acetate into an autoclave, then adding methanol, replacing nitrogen for three times, and adding a catalyst Pd (dppf) Cl₂Introducing carbon monoxide, keeping the internal pressure at 50 Psi, heating to 80 ℃, stirring and reacting for 8-9H, concentrating the reaction solution until the reaction solution is dry, adding a methanol-water mixed solvent for pulping, wherein the volume ratio of methanol to water is 1:4, filtering to be dry, and pulping by using methyl tert-butyl ether to obtain a white solid, namely 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-ylmethylene) methyl benzoate;

preparation of S4, 2-fluoro-5- [ (4-oxo-3H-2, 3-naphthyridinyl) methyl ] benzoic acid: adding tetrahydrofuran into the methyl 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-yl methylene) benzoate obtained in the step, cooling to 8 ℃, adding hydrazine hydrate, recovering to 25 ℃, continuing stirring, reacting for 4-5H, then adding acetone, stirring, adding NaOH aqueous solution, heating to 40 ℃, reacting for 3-4H, cooling to room temperature, extracting the aqueous phase with methyl tert-butyl ether, adjusting the pH value to 3.0 with hydrochloric acid, separating out white solid, filtering, rinsing with cold water, and recrystallizing with ethyl acetate to obtain white solid 2-fluoro-5- [ (4-oxo-3H-2, 3-diazanaphthalyl) methyl ] benzoic acid.

2. The process according to claim 1 for producing 2-fluoro-5- [ (4-oxo-3H-2, 3-naphthyridinyl) methyl ] benzoic acid, which comprises: the molar ratio of o-carboxybenzaldehyde, dimethyl phosphite and triethylamine in the step S1 is 1:1.3: 1.3.

3. The process according to claim 1 for producing 2-fluoro-5- [ (4-oxo-3H-2, 3-naphthyridinyl) methyl ] benzoic acid, which comprises: in the step S2, the molar ratio of (3-oxo-1, 3-dihydroisobenzofuran-1-yl) dimethyl phosphate, 3-bromo-4-fluorobenzaldehyde and triethylamine is 1:1: 1.1.

4. The process according to claim 1 for producing 2-fluoro-5- [ (4-oxo-3H-2, 3-naphthyridinyl) methyl ] benzoic acid, which comprises: the molar ratio of the solid 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-ylmethylene) bromobenzene in the step S3 to the sodium acetate was 1: 3.1.

Technical Field

The invention belongs to the technical field of drug synthesis, and particularly relates to a preparation method of 2-fluoro-5- [ (4-oxo-3H-2, 3-diazanaphthyl) methyl ] benzoic acid.

Background

Olaparib (Olaparib, AZD2281, Ku-0059436) is a selective inhibitor of poly (adenosine diphosphate ribose) polymerase 1/2(PARP1/2), approved by the U.S. Food and Drug Administration (FDA) on the market 12 months 2014. Olaparib inhibits PARP, blocking base excision repair, resulting in epithelial cells KB2P being strongly sensitive to olaparib. The single-strand break is converted into a double-strand break during DNA replication, thereby activating a recombination pathway dependent on the breast cancer gene No. 2 (BRCA 2). Has been used for treating tumor with mutation of breast cancer No. 1 gene (BRCA 1) or breast cancer No. 2 gene (BRCA 2), such as ovarian cancer, thymus cancer, and prostate cancer. In addition, olaparib inhibits tumor cells deficient in the ataxia telangiectasia gene (ATM) with selectivity, suggesting that olaparib may be a potential agent for the treatment of ATM mutated lymphoid tumors. The chemical name of Olaparib (Olaparib) is: 1- (cyclopropylformyl) -4- [5- [ (3, 4-dihydro-4-oxo-1-phthalazinyl) methyl ] -2-fluorobenzoyl ] piperazine having the following structural formula:

；

according to literature investigations, the synthesis of olaparib requires the following intermediates:

、、；

wherein the compound II is 2-fluoro-5- [ (4-oxo-3H-2, 3-diazanaphthyl) methyl ] benzoic acid, and the synthetic route thereof reported in the literature mainly comprises:

document J. Med. Chem. 2008, 51: 6581-6591 the synthesis method reported is as follows:

the first step is as follows:；

the second step is that:；

the third step:

；

according to the route, o-carboxybenzaldehyde is used as a raw material and reacts with dimethyl phosphite in sequence to generate an intermediate (II), then the intermediate (II) and 2-fluoro-5-formyl benzonitrile are subjected to Horner-Wadsworth-Emmons reaction to generate an intermediate (III) 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-ylmethylene) benzonitrile, the intermediate (III) is subjected to cyano hydrolysis under an alkaline condition to generate carboxyl, and the carboxyl is cyclized with hydrazine hydrate to obtain an Intermediate (IV) 2-fluoro-5- [ (4-oxo-3, 4-dihydrophenazine-1-yl) methyl ] benzoic acid. In the process of carrying out Horner-Wadsworth-Emmons reaction on the intermediate (II) and 2-fluoro-5-formylbenzonitrile to generate the intermediate (III), more side reactions, more complex reactions, lower overall yield and higher raw material cost are caused by the existence of cyano, which can bring about more serious post-treatment cost of wastewater and is not suitable for the requirement of industrial production;

patent CN105820126B uses 5- (bromomethyl) -2-fluorobenzoic acid methyl ester as raw material, and obtains olaparib through boration reaction, coupling reaction, and hydrolysis, and the reaction route is as follows:

the first step is as follows:

；

the second step is that:

；

the third step:

。

the method adopts pyrocatechol borane, which is expensive, and in addition, a palladium catalyst adopted in the coupling reaction is expensive, so that the palladium residue in the post-treatment is difficult to treat, and the method is not beneficial to industrial production;

in order to solve the problems of low yield and low yield of the existing 2-fluoro-5- [ (4-oxo-3H-2, 3-diazanaphthyl) methyl ] benzoic acid, the invention aims to provide a preparation method of an olaparib drug intermediate, which has the advantages of cheap and easily available raw materials, high yield, reduced byproducts, high product purity, low production cost and simple and convenient operation.

Disclosure of Invention

The present invention aims to provide a method for preparing 2-fluoro-5- [ (4-oxo-3H-2, 3-diazanaphthyl) methyl ] benzoic acid, so as to solve the problems in the background art.

A synthetic scheme of 2-fluoro-5- [ (4-oxo-3H-2, 3-naphthyridinyl) methyl ] benzoic acid is shown as follows:

the first step is as follows:；

the second step is that:；

the third step:；

the fourth step:

in order to achieve the purpose, the invention provides the following technical scheme: a preparation method of 2-fluoro-5- [ (4-oxo-3H-2, 3-diazanaphthyl) methyl ] benzoic acid comprises the following steps in sequence:

s1, mixing and stirring o-carboxybenzaldehyde, triethylamine and dichloromethane, adding dimethyl phosphite, stirring and reacting for 4-5 h at room temperature, adding methanesulfonic acid, stirring for 30min until the reaction is finished, concentrating the reaction solution to be dry, adding water, pulping for 2-3 h, filtering, and pulping with petroleum ether to obtain white solid (3-oxo-1, 3-dihydroisobenzofuran-1-yl) dimethyl phosphate;

s2, mixing the (3-oxo-1, 3-dihydroisobenzofuran-1-yl) dimethyl phosphate obtained in the step, 3-bromo-4-fluorobenzaldehyde and dichloromethane, cooling to 6 ℃, dropwise adding triethylamine, reacting at room temperature for 4-5H, concentrating the reaction liquid to dryness, adding water, packaging, filtering to dryness, and pulping by using methyl tert-butyl ether to obtain white solid 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-ylmethylene) bromobenzene;

s3, adding the solid 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-yl methylene) bromobenzene obtained in the step and sodium acetate into an autoclave, then adding methanol, replacing nitrogen for three times, and adding a catalyst Pd (dppf) Cl₂Introducing carbon monoxide, keeping the internal pressure at 50 Psi, heating to 80 ℃, stirring and reacting for 8-9H, concentrating the reaction solution until the reaction solution is dry, adding a methanol-water mixed solvent for pulping, wherein the volume ratio of methanol to water is 1:4, filtering to be dry, and pulping by using methyl tert-butyl ether to obtain a white solid, namely 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-ylmethylene) methyl benzoate;

s4, adding tetrahydrofuran into the methyl 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-ylmethylene) benzoate obtained in the step, cooling to 8 ℃, adding hydrazine hydrate, recovering to 25 ℃, continuing stirring, reacting for 4-5H, then adding acetone, stirring, adding NaOH aqueous solution, heating to 40 ℃, reacting for 3-4H, cooling to room temperature, extracting the aqueous phase with methyl tert-butyl ether, adjusting the pH value to 3.0 with hydrochloric acid, separating out a white solid, filtering, rinsing with cold water, and recrystallizing with ethyl acetate to obtain a white solid 2-fluoro-5- [ (4-oxo-3H-2, 3-diazanaphthyl) methyl ] benzoic acid.

Preferably, the molar ratio of o-carboxybenzaldehyde, dimethyl phosphite and triethylamine in the step of S1 is 1:1.3: 1.3.

In any of the above schemes, it is preferable that the molar ratio of the dimethyl (3-oxo-1, 3-dihydroisobenzofuran-1-yl) phosphate, the 3-bromo-4-fluorobenzaldehyde and the triethylamine in the step S2 is 1:1: 1.1.

In any of the above schemes, the molar ratio of the solid 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-ylmethylene) bromobenzene in the step S3 to sodium acetate is preferably 1: 3.1.

The invention has the technical effects and advantages that: the preparation method has the advantages of simple operation, mild reaction conditions, easy purification of the intermediate, higher total yield than the prior art and lower industrial cost.

Detailed Description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

20 g (133 mmol) of o-carboxybenzaldehyde, 17.5 g (173 mmol) of triethylamine and 200mL of dichloromethane are added into a three-necked flask for mixing and stirring, 19.1 g (173 mmol) of dimethyl phosphite is added, the mixture is stirred and reacted for 4 hours at room temperature, 17.9 g (186 mmol) of methanesulfonic acid is added dropwise after TLC monitoring reaction is completed, the mixture is stirred for 30 minutes, TLC monitoring reaction is completed, the reaction solution is concentrated to be dry, water is added for pulping for 2 hours, the mixture is filtered to be dry, and then petroleum ether is used for pulping to obtain 30 g of white solid, the yield is 93 percent, and the white solid is (3-oxo-1, 3-dihydroisobenzopyran-1-yl) dimethyl phosphate;

example 2:

adding 20 g (83 mmol) of (3-oxo-1, 3-dihydroisobenzocerate-1-yl) dimethyl phosphate, 16.8 g (83 mmol) of 3-bromo-4-fluorobenzaldehyde and 200mL of dichloromethane into a three-necked bottle, mixing, cooling to 6 ℃, dropwise adding 9.2 g (91 mmol) of triethylamine, reacting for 4 hours at room temperature, monitoring by TLC to finish the reaction, concentrating the reaction solution to dryness, adding 200mL of water, pulping, filtering to dryness, and pulping with methyl tert-butyl ether to obtain 25.2 g of a white solid, wherein the yield is 95%, and 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-ylmethylene) -1-bromobenzene;

example 3:

25.0 g (78 mmol) of 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-ylmethylene) -1-bromobenzene and 20.0 g (243 mmol) of sodium acetate were charged into the autoclave, which was then charged into 100mL of methanol, and after three nitrogen replacements, Pd (dppf) Cl was added₂0.85 g (1 mmol), keeping the internal pressure at 50 Psi under carbon monoxide atmosphere, heating to 80 deg.C, stirring for 8h, TLC detecting reaction, concentrating the reaction solution to dryness, adding 200mL mixed solvent of methanol and water (V/V =1: 4), pulping, filtering, and pulping with methyl tert-butyl ether to obtain white solid20.7 g of solid, 89% yield methyl 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-ylmethylene) benzoate;

example 4:

adding 14.9 g (50mmol) of 2-fluoro-5- (3-oxo-3H-isobenzofuran-1-yl methylene) methyl benzoate and 100mL of water into a flask, mixing, adding tetrahydrofuran, cooling to 8 ℃, dropwise adding 3.6 mL (75 mmol) of 80% hydrazine hydrate, then returning to 25 ℃, continuing stirring, reacting for 4H, then adding 5 mL of acetone, stirring for 30min, then adding 16.3 mL of 4mol/L NaOH aqueous solution, heating to 40 ℃, reacting for 3H, cooling to room temperature, extracting an aqueous phase with 100mL of methyl tert-butyl ether, adjusting the pH value to about 3.0 with hydrochloric acid, precipitating a white solid, filtering, rinsing with 40 mL of cold water, recrystallizing with ethyl acetate to obtain 14.2 g of white solid with the yield of 95%, wherein the white solid is 2-fluoro-5- [ (4-oxo-3H-2, 3-naphthyridinyl) methyl ] benzoic acid.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.