阅读说明：本技术 一类含二硫醚结构的喹唑啉酮类衍生物的制备方法及其应用 (Preparation method and application of quinazolinone derivatives containing disulfide structures ) 是由 欧阳贵平 朱梅 王贞超 李焱 樊思莉 陶世林 于 2021-09-22 设计创作，主要内容包括：本发明涉及一类含二硫醚结构的喹唑啉酮类衍生物的制备方法及其应用。该化合物具有如通式(I)所示的结构：本发明以喹唑啉酮为母体结构,将二硫烷基(杂环)结构引入到此体系中,合成了一系列含二硫醚结构的喹唑啉酮类衍生物,该系列化合物对植物致病病原细菌具有很好的抑制作用,如对水稻白叶枯病菌、柑橘溃疡病菌、猕猴桃溃疡病菌及茄青枯雷尔氏菌等。(The invention relates to a preparation method and application of quinazolinone derivatives containing disulfide structures. The compound has a structure shown as a general formula (I):)

1. A kind of quinazolinone derivatives containing disulfide structure is characterized in that: the compound has a structure shown as a general formula (I):

wherein the content of the first and second substances,

r is selected from any substituted or unsubstituted alkyl, any substituted or unsubstituted cycloalkyl and any substituted or unsubstituted aryl.

2. The quinazolinone derivative having a disulfide structure according to claim 1, wherein: r is selected from alkyl, cycloalkyl, and substituted or unsubstituted aryl.

3. The quinazolinone derivative having a disulfide structure according to claim 1, wherein: r is selected from C₂-C₁₀Alkyl, aryl, heteroaryl, and heteroaryl,C₅-C₆Cycloalkyl, substituted or unsubstituted C₆-C₇Aryl, wherein said substitution is by C₁-C₁₀Alkyl radical, C₁-C₁₀One or more of alkoxy, amino, hydroxyl, halogen, nitro and trifluoromethyl.

4. The quinazolinone derivative according to claim 3, wherein said disulfide structure comprises one of the following structural groups: r is selected from ethyl, propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, isopentyl, neopentyl, cyclopentyl, cyclohexyl, hexyl, heptyl, octyl, nonyl, decyl, substituted or unsubstituted phenyl, substituted or unsubstituted benzyl, wherein said substitution is by C₁-C₁₀Alkyl radical, C₁-C₁₀Alkoxy, amino, hydroxyl, halogen, nitro and trifluoromethyl.

5. The preparation method of the quinazolinone derivatives containing disulfide structure according to any of claims 1-4, characterized in that it comprises the following steps:

6. a composition comprising a compound according to any one of claims 1 to 4 and an agriculturally acceptable adjuvant or fungicide.

7. Use of a compound according to any one of claims 1 to 4, or a composition according to claim 6, for the manufacture of a medicament for the control of bacterial diseases in plants.

8. Use according to claim 7, characterized in that: preferably, the agricultural pest is a bacterial disease of a plant.

9. Use according to claim 7, characterized in that: the agricultural pests and diseases are plant leaf blight, plant canker and plant bacterial wilt.

10. Use according to claim 7, characterized in that: the agricultural diseases and pests are rice bacterial leaf blight, citrus canker, kiwi canker and bacterial wilt.

Technical Field

The invention relates to the technical field of agricultural pharmacy, in particular to a preparation method and application of quinazolinone derivatives containing disulfide structures.

Background

Bacterial plant diseases are one of the most destructive plant diseases, which not only affect the healthy and stable development of agriculture, but also pose a significant threat to food safety. Among them, bacterial diseases caused by Xanthomonas oryzae pv. oryzae, Xanthomonas citri, Xanthomonas axanopolis pv. citri, Actinidia kiwii, and Ralstonia solanacearum (Rs) cause annual agricultural losses of several billion dollars.

The application of chemical pesticide is always the main measure for preventing and controlling plant bacterial diseases, and has the advantages of wide bactericidal spectrum, quick effect, low cost and the like, and meanwhile, along with the upgrade and update of scientific technology, the usage amount of pesticide is reduced from 1 kg per hectare in the last 60 years to 10g per hectare in the past half or more centuries, which is not only a huge achievement for crop protection, but also for environmental protection. However, the problems of pesticide residue and environmental pollution caused by the inevitable long-term application of chemical pesticides are greatly challenged to human health and ecological balance, and in addition, the problem of drug resistance of many commercial pesticides has occurred to different degrees, so that a high-activity and low-resistance compound for resisting plant pathogenic bacteria is urgently needed to be searched, a new green pesticide with independent intellectual property rights is created on the basis, and a candidate drug is provided for preventing and controlling the bacterial diseases of crops.

Quinazolinone compounds are a group of natural active substances commonly existing in nature, and the naturally occurring quinazolinone compounds have various biological activities, such as: antibacterial, antitumor, anticonvulsant, antimalarial, anti-inflammatory, etc., and a plurality of compounds with better antibacterial activity are also found by taking quinazolinone as a parent structure for derivation; in addition, disulfide derivatives have a wide range of biological activities, such as antibacterial, antifungal and antitumor properties, and among them, the unique bactericidal action of the disulfide antibacterial compound allicin (allicin) has attracted extensive attention and research.

In order to search for efficient and resistant bactericidal active compounds, the invention takes quinazolinone as a parent structure, introduces disulfide bonds with biological activity into the system, synthesizes a series of 2-substituted disulfanyl-4 (3H) -quinazolinone derivatives, inspects the bactericidal biological activity of the derivatives, and provides a certain scientific basis for the research and development of new pesticides.

The research on the biological activity of the quinazolinone derivatives progresses as follows:

in 2018, dozens of quinazolinone derivatives were synthesized by Megahed [ Megahed M, Fathrala W, Alsheikh A. Synthesis and antibacterial Activity of Methyl2- (2- (2-Arylquinazolin-4-yl) oxy) acetic amino Alkanoates [ J ]. Journal of Heterocyclic chemistry.2018,55(12):2799-2808 ], and the antibacterial Activity of these compounds on Escherichia coli, Candida albicans and Staphylococcus aureus was determined. The biological activity results show that: compared with a control antibiotic, part of the glycine derivative, the valine derivative and the carboxylic acid derivative have remarkable antibacterial activity on three pathogenic bacteria.

In 2019, Gatadi [ Gatadi S, Gour J, Shukla M, et al.Synthesis and evaluation of new 4-oxoquinazolin-3(4H) -yl) benzoic acid and benzamide derivatives as potential antibiotic agents effective against viral resistant bacterial diseases [ J ] Bioorganic chemistry.2019,83: 569. sylocryc 579 ], and preliminary activity screening showed that: most of the compounds show low cytotoxicity to Vero (Vero cells) and good selectivity index (Si >10) while showing good inhibitory activity to staphylococcus aureus (MIC is 0.25-8 mu g/mL).

In 2019, Mostafavi [ Mostafavi H, Islami M R, Khabazzadeh H, et al, synthesis of New Quinazolin-4- (3H) -one Derivatives and Evaluation of theoretical Biological Activities [ J ]. chemistry select.2019,4(11):3169-3174 ] and the like use p-toluenesulfonic acid as a catalyst, o-aminobenzamide Derivatives and aldehyde as raw materials, a series of novel quinazolinone Derivatives containing azopyridinyl and 4-aminobenzamide groups were synthesized by a one-pot method, and the antibacterial Activities of the synthesized compounds on klebsiella pneumoniae, escherichia coli, staphylococcus aureus, bacillus cereus and candida albicans were measured by using sulfamethoxazole and ciprofloxacin as contrast agents, and the results show that: almost all compounds have good antibacterial activity against bacillus cereus and candida albicans.

The research on the biological activity of disulfide compounds has progressed as follows:

in 2008, a series of asymmetric disulfide derivatives were synthesized by Turos [ Turos E, Revell K D, Ramaraju P, et al, asymmetric methyl aryl-alkyl sulfate growth inhibition of methicillin-resistant Staphylococcus aureus and Bacillus anthracnose [ J ]. Bioorganic & medicinal chemistry.2008,16(13):6501 and 6508 ], etc., and the series of compounds were found to have different degrees of inhibition on Staphylococcus aureus, methicillin-resistant Staphylococcus aureus, Bacillus anthracis and Escherichia coli, and the structure-activity relationship of the first three pathogenic bacteria was found: when the aromatic ring has an electron-withdrawing substituent, the activity is better, wherein the activity of meta-substitution and para-substitution is better than that of ortho-substitution; if a carbon atom is inserted between the substituted benzene ring and the sulfur atom, the activity is reduced; in addition, if there is a hydrophilic substituent on the aromatic ring, the activity decreases; the chain length of the linear chain is increased, the activity is increased, and the activity of the branched chain substitution is better than that of the linear chain substitution. In Escherichia coli, the activity is better when the alkyl group is methyl or ethyl. These results show that: the method is favorable for reducing the charge density of sulfur in the disulfide bond, namely, the substituent group for increasing the nucleophilic substitution reaction activity is favorable for increasing the antibacterial activity, and meanwhile, in order to ensure the activity of the compound, a lipophilic group needs to be introduced into the molecular structure, so that the compound can conveniently permeate cell membranes.

In 2018, a series of disulfide derivatives containing pyridyl groups were designed and synthesized by Shepard [ Shepard J G, McAleer J P, Sarakar P, et al, Alicin-immobilized pyridine derivatives as anti-biotic agents for multidrug-resistant Staphylococcus aureus [ J ]. Europeanjurnal of medicinal chemistry.2018,143:1185-1195 ], and the like, and the inhibitory activity of the target compound on multi-drug resistant Staphylococcus aureus was determined, under the physiological condition of thallus, the pyridyl groups in the series of compounds would form quaternary ammonium salts, thereby reducing the electron cloud density of sulfur, facilitating the exchange reaction of disulfide bonds and free sulfydryl, which becomes a structural premise with improved activity. Researches show that part of target compounds not only have better antibacterial activity, but also realize the synergistic antibacterial action when being used together with vancomycin, thereby increasing the antibacterial effect of the compounds and showing low toxicity to normal cells of a human body. The preliminary action mechanism research finds that the compounds not only cause the damage of thallus membranes, but also reduce the metabolism level of bacteria and inhibit the growth of thallus.

In 2016, a series of N-alkylfluoroquinolone thioether derivatives were prepared by introducing thioether into the parent structure of Ciprofloxacin (CIP) by Shepard [ Shepard J G, Long T E. albumin-immobilized fluoroquinolones as antibiotics, ESKAPE pathway [ J ]. Bioorganic & medicinal chemistry letters, 26(22):5545-5549 ], et al, and the antibacterial activity and the activity of the target compounds against ESKAPE (Enterococcus spp., Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, and Enterbacter spp.) were determined, and the results of the studies were consistent with the results of the primary inhibition of the activity of the target compounds against GSH-Staphylococcus aureus and the secondary inhibition of glutathione S, and the results of the secondary inhibition of the activity of the target compounds against GSH-Staphylococcus aureus (MRGS-S) Ionic fragment peaks of CIP and GSH, which preliminarily evidence that the mechanism of action of the active compound may be the binding of S-alkyl to glutathione. In addition, ciprofloxacin is released while the substitution reaction is carried out, so that the bacteriostatic activity of the target compound is further enhanced.

Disclosure of Invention

The invention provides a quinazoline ketone derivative containing a disulfide structure.

The invention also provides a preparation method of the compound and a preparation method thereof.

It is also an object of the present invention to provide the use of the above compound or the composition.

The invention also aims to provide a method for controlling agricultural pests by using the compound or the composition.

In order to realize the purpose, the invention adopts the following technical scheme:

a quinazoline ketone derivative containing a disulfide structure has a structure shown as a general formula (I):

wherein the content of the first and second substances,

r is selected from any substituted or unsubstituted alkyl, any substituted or unsubstituted cycloalkyl and any substituted or unsubstituted aryl.

Further preferably, R is selected from alkyl, cycloalkyl, substituted or unsubstituted aryl;

preferably, R is selected from C₂-C₁₀Alkyl radical, C₅-C₆Cycloalkyl, substituted or unsubstituted C₆-C₇Aryl, wherein said substitution is by C₁-C₁₀Alkyl radical, C₁-C₁₀One or more of alkoxy, amino, hydroxyl, halogen, nitro and trifluoromethyl;

more preferably, R is selected from ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, isopentyl, neopentyl, cyclopentyl, cyclohexyl, hexyl, heptyl, octyl, nonyl, decyl, substituted or unsubstituted phenyl, substituted or unsubstituted benzyl, wherein said substitution is by C₁-C₁₀Alkyl radical, C₁-C₁₀One or more of alkoxy, amino, hydroxyl, halogen, nitro and trifluoromethyl;

most preferably, R is selected from the group consisting of ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, isopentyl, neopentyl, cyclopentyl, cyclohexyl, hexyl, heptyl, octyl, nonyl, decyl, phenyl, 4-methylphenyl, 4-methoxyphenyl, 2-bromophenyl, 3-bromophenyl, 4-bromophenyl, 2-chlorophenyl, 3-chlorophenyl, 4-chlorophenyl, 2-fluorophenyl, 3-fluorophenyl, 4-fluorophenyl, benzyl, 2-methoxybenzyl, 3-methoxybenzyl, 4-methoxybenzyl, 2-methylbenzyl, 3-methylbenzyl, 4-methylbenzyl.

The quinazoline ketone derivative containing the disulfide structure comprises the following compounds:

the invention also provides a preparation method of the quinazolinone derivative containing the disulfide structure, which comprises the following steps:

the compound or the composition can be used for controlling agricultural pests, preferably, the agricultural pests are plant bacterial diseases; more preferably, the agricultural pests are plant leaf blight, plant canker and plant bacterial wilt; most preferably, the agricultural pest is rice bacterial blight, citrus canker, kiwi canker, bacterial wilt.

The term "alkyl" as used herein is intended to include both branched and straight chain saturated hydrocarbon radicals having the specified number of carbon atoms. E.g. "C_2-10Alkyl "(or alkylene) groups are intended to be C2, C3, C4, C5, C6, C7, C8, C9 and C10 alkyl groups. In addition, for example "C_2-10Alkyl "denotes an alkyl group having 2 to 10 carbon atoms. Alkyl groups may be unsubstituted or substituted such that one or more of its hydrogen atoms are replaced with another chemical group. Examples of alkyl groups include, but are not limited to, ethyl (Et), propyl (e.g., n-propyl and isopropyl), butyl (e.g., n-butyl, isobutyl, tert-butyl), pentyl (e.g., n-pentyl, isopentyl, neopentyl), hexyl, heptyl, octyl, nonyl, decyl, and the like. Also, when reference is made to hexyl, heptyl, octyl, all of the same are included in addition to n-hexyl, n-heptyl, n-octylSeparating isomers.

The term "substituted" as used herein means that any one or more hydrogen atoms on the designated atom or group is replaced with the designated group of choice, provided that the general valence of the designated atom is not exceeded. If not otherwise stated, substituents are named to the central structure. For example, it is understood that when (cycloalkyl) alkyl is a possible substituent, the point of attachment of the substituent to the central structure is in the alkyl moiety. When referring to substitution, especially polysubstitution, it is meant that the various substituents are substituted at various positions on the indicated group, e.g. dichlorophenyl means 1, 2-dichlorophenyl, 1, 3-dichlorophenyl and 1, 4-dichlorophenyl.

Combinations of substituents and or variables are permissible only if such combinations result in stable compounds or useful synthetic intermediates. A stable compound or stable structure implies that the compound is sufficiently stable to be isolated in useful purity from the reaction mixture and subsequently formulated to form an effective therapeutic agent.

The term "aryl" refers to a monocyclic aromatic hydrocarbon group having 6 carbon atoms in the ring portion, such as phenyl.

The term "halogen" or "halogen atom" refers to chlorine, bromine, fluorine.

Preferably, C₂-C₁₀Alkyl refers to ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl and isomers thereof;

when substituents are mentioned, such as alkenyl, alkynyl, alkyl, halo, aryl, heteroaryl, alkoxy, cycloalkyl, hydroxy, amino, mercapto, phosphino, or when these substituents are specifically alkenyl, alkynyl, alkyl, halo, aryl, heteroaryl, alkoxy, cycloalkyl, hydroxy, amino, mercapto, phosphino, one to three of the above substituents are meant. Such as methylphenyl refers to phenyl substituted with one to three methyl groups.

The invention has the beneficial effects that: by adopting the technical scheme, the invention synthesizes a series of quinazolinone derivatives containing disulfide structures on the basis of quinazolinone structures, and finds that the compounds have good inhibitory action on part of plant pathogenic bacteria, such as rice bacterial blight (Xanthomonas oryzae pv. oryzae, Xoo), citrus canker (Xanthomonas axonopoda pv. citri), kiwi canker (Pseudomonas syringae pv. Actinidiae, Psa), Ralstonia solanacearum (Rs) and the like, so that a certain scientific basis is provided for research and development of new pesticides.

Detailed Description

The invention is further illustrated by the following examples. It should be understood that the method described in the examples is only for illustrating the present invention and not for limiting the present invention, and that simple modifications of the preparation method of the present invention based on the concept of the present invention are within the scope of the claimed invention. All the starting materials and solvents used in the examples are commercially available products.

Example 1:synthesis of 2- (ethyldisulfide) -4(3H) -quinazolinone derivatives

(1) Preparation of 2-mercapto-4 (3H) -quinazolinone

Adding 1.65g of potassium hydroxide and 100mL of absolute ethyl alcohol into a 250mL round-bottom flask in sequence, stirring for dissolving, dropwise adding 4.42mL of carbon disulfide, subsequently heating to 30 ℃, adding 10g of 2-aminobenzamide after half an hour, supplementing about 60mL of absolute ethyl alcohol, heating to 90 ℃, refluxing, after about 5 hours, displaying that a raw material point disappears by TLC (thin layer chromatography), cooling to room temperature after reaction is finished, separating out a white solid, performing suction filtration, dissolving a filter cake by using ice water, adjusting the pH to be neutral by using hydrochloric acid, separating out a large amount of solid, and drying to obtain 6.28g of white solid, wherein the yield is 47.96%.

(2) Preparation of ethyl sulfur chloride

8mL of dichloromethane and 0.62g (9.98mmol) of ethyl mercaptan are added into a round-bottomed bottle, 2.69g (19.96mmol) of sulfonyl chloride is dropwise added under ice bath, the mixture reacts for 1h under ice bath conditions, the solvent is removed by rotary evaporation, and the mixture is dissolved by a mixed solvent of ethyl acetate/petroleum ether and then is directly used for the next reaction.

(3) Preparation of 2- (ethyldisulfide) -4(3H) -quinazolinone

Adding 40mL of ethyl acetate/petroleum ether mixed solvent and 0.8g (4.49mmol) of 2-mercapto-4 (3H) -quinazolinone into a round-bottom flask, dropwise adding the reaction product into a reaction system, stirring at normal temperature overnight, adding about 50mL of petroleum ether, stirring, filtering, washing with saturated sodium bicarbonate/sodium carbonate aqueous solution for multiple times, and passing the ethyl acetate/petroleum ether mixed solvent through a column to obtain a white target product with the yield of 63.55%.

Example 2:synthesis of 2- (propyldisulfide) -4(3H) -quinazolinone derivatives

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of propyl thio chloride and 2- (propyl disulfide) -4(3H) -quinazolinone reference example 1, wherein the molar ratio of sulfonyl chloride, propyl thiol and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

example 3:synthesis of 2- (isopropyldisulfide) -4(3H) -quinazolinone derivatives

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of isopropylthio-chloride and 2- (isopropyldisulfide) -4(3H) -quinazolinone reference is made to example 1, wherein the molar ratio of sulfonyl chloride, isopropylthiol and 2-mercapto-4 (3H) -quinazolinone fed is 4: 2: 1.

example 4:synthesis of 2- (butyldisulfide) -4(3H) -quinazolinone derivatives

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of butylthiochloride and 2- (butyldisulfide) -4(3H) -quinazolinone reference was made to example 1, wherein the molar ratio of sulfonyl chloride, butylthiol and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

example 5:synthesis of 2- (isobutyl disulfide) -4(3H) -quinazolinone derivatives

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of isobutyl thio chloride and 2- (isobutyl disulfide) -4(3H) -quinazolinone reference was made to example 1, wherein the molar ratio of sulfonyl chloride, isobutyl thiol and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

example 6:synthesis of 2- (sec-butyldisulfide) -4(3H) -quinazolinone derivatives

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of sec-butylthio chloride and 2- (sec-butyldisulfide) -4(3H) -quinazolinone reference example 1, wherein the molar ratio of sulfonyl chloride, sec-butylthiol and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

example 7:synthesis of 2- (tert-butyl disulfide) -4(3H) -quinazolinone derivatives

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of tert-butylthiochloride and 2- (tert-butyldisulfide) -4(3H) -quinazolinone reference example 1, wherein the molar ratio of sulfonyl chloride, tert-butylthiol and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

example 8:synthesis of 2- (3-methyl-2-butyldisulfide) -4(3H) -quinazolinone derivative

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of 3-methyl-2-butylthiochloride and 2- (3-methyl-2-butyldisulfide) -4(3H) -quinazolinone reference example 1, wherein the molar ratio of sulfonyl chloride, 3-methyl-2-butylthiol and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

example 9:synthesis of 2- (pentyldisulfide) -4(3H) -quinazolinone derivatives

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of amyl thio chloride and 2- (amyl disulfide) -4(3H) -quinazolinone reference was made to example 1, where the molar ratio of sulfonyl chloride, amyl thiol and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

example 10:synthesis of 2- (isopentyl disulfide) -4(3H) -quinazolinone derivatives

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of isopentyl sulfur chloride and 2- (isopentyl disulfide) -4(3H) -quinazolinone reference example 1, wherein the molar ratio of sulfonyl chloride, isopentyl thiol, and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

example 11:synthesis of 2- (hexyldisulfide) -4(3H) -quinazolinone derivatives

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of hexyl thio-chloride and 2- (hexyl disulfide) -4(3H) -quinazolinone reference is made to example 1, where the molar ratio of sulfonyl chloride, hexyl thiol and 2-mercapto-4 (3H) -quinazolinone fed is 4: 2: 1.

example 12:synthesis of 2- (cyclohexyl disulfide) -4(3H) -quinazolinone derivatives

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of cyclohexyl sulfur chloride and 2- (cyclohexyl disulfide) -4(3H) -quinazolinone reference is made to example 1, wherein the molar ratio of sulfonyl chloride, cyclohexyl thiol and 2-mercapto-4 (3H) -quinazolinone fed is 4: 2: 1.

example 13:synthesis of 2- (heptyldisulfide) -4(3H) -quinazolinone derivatives

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of heptyl thiochloride and 2- (heptyl-disulfide) -4(3H) -quinazolinone reference was made to example 1, wherein the molar ratio of sulfonyl chloride, heptyl-thiol and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

example 14:synthesis of 2- (octyl disulfide) -4(3H) -quinazolinone derivatives

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of octyl sulfur chloride and 2- (octyl disulfide) -4(3H) -quinazolinone reference example 1, wherein the molar ratio of sulfonyl chloride, octyl thiol and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

example 15:synthesis of 2- (benzyldisulfide) -4(3H) -quinazolinone derivatives

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of benzylthio chloride and 2- (benzyldisulfide) -4(3H) -quinazolinone reference is made to example 1, where the molar ratio of sulfonyl chloride, benzylthiol and 2-mercapto-4 (3H) -quinazolinone fed is 4: 2: 1.

example 16:synthesis of 2- (4-methylphenyl disulfide) -4(3H) -quinazolinone derivative

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of 4-methylphenylthiochloride and 2- (4-methylphenyldisulfide) -4(3H) -quinazolinone reference is made to example 1, wherein the molar ratio of sulfonyl chloride, 4-methylphenylthiol and 2-mercapto-4 (3H) -quinazolinone fed is 4: 2: 1.

example 17:synthesis of 2- (4-fluorophenyl disulfide) -4(3H) -quinazolinone derivative

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of 4-fluorophenyl thio chloride and 2- (4-fluorophenyl disulfide) -4(3H) -quinazolinone reference example 1, wherein the molar ratio of sulfonyl chloride, 4-fluorophenylthiol and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

example 18:synthesis of 2- (4-chlorophenyl disulfide) -4(3H) -quinazolinone derivative

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of 4-chlorophenyl thiochloride and 2- (4-chlorophenyl disulfide) -4(3H) -quinazolinone reference example 1, wherein the molar ratio of sulfonyl chloride, 4-chlorothiophenol and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

example 19:synthesis of 2- (4-bromophenyl disulfide) -4(3H) -quinazolinone derivative

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of 4-bromophenyl thiochloride and 2- (4-bromophenyl disulfide) -4(3H) -quinazolinone reference example 1, wherein the molar ratio of sulfonyl chloride, 4-bromophenylthiol and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

example 20:synthesis of 2- (4-methoxyphenyl disulfide) -4(3H) -quinazolinone derivative

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of 4-methoxyphenyl thiochloride and 2- (4-methoxyphenyl disulfide) -4(3H) -quinazolinone reference example 1, wherein the molar ratio of sulfonyl chloride, 4-methoxythiophenol and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

example 21:synthesis of 2- (3-fluorophenyl disulfide) -4(3H) -quinazolinone derivative

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of 3-fluorophenyl thio chloride and 2- (3-fluorophenyl disulfide) -4(3H) -quinazolinone reference example 1, wherein the molar ratio of sulfonyl chloride, 3-fluorophenylthiol and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

example 22:synthesis of 2- (2-fluorophenyl disulfide) -4(3H) -quinazolinone derivative

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of 2-fluorophenyl thio chloride and 2- (2-fluorophenyl disulfide) -4(3H) -quinazolinone reference example 1, wherein the molar ratio of sulfonyl chloride, 2-fluorophenylthiol and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

example 23:synthesis of 2- (2-chlorophenyl disulfide) -4(3H) -quinazolinone derivative

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of 2-chlorophenyl thiochloride and 2- (2-chlorophenyl disulfide) -4(3H) -quinazolinone reference example 1, wherein the molar ratio of sulfonyl chloride, 2-chlorothiophenol and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

example 24:synthesis of 2- (2-bromophenyl disulfide) -4(3H) -quinazolinone derivative

2-mercapto-4 (3H) -quinazolinone was prepared as described in example 1; preparation of 2-bromophenyl thiochloride and 2- (2-bromophenyl disulfide) -4(3H) -quinazolinone reference example 1, wherein the molar ratio of sulfonyl chloride, 2-bromophenylthiol and 2-mercapto-4 (3H) -quinazolinone fed was 4: 2: 1.

TABLE 1 NMR hydrogen and carbon spectra data for some of the compounds

Table 2 physicochemical properties of the target compounds

Pharmacological example 1:

the inhibition rate of a target compound on plant pathogenic bacteria is tested by adopting a turbidity method, the test objects are rice bacterial blight (Xoo), kiwi fruit canker (Psa), ralstonia solanacearum (Rs) and citrus canker (Xac), the culture medium is added with an equal volume of DMSO (dimethyl sulfoxide) as a blank control, and bismerthazol (90%) and Shenqinmycin (99.3%) are used as positive control drugs. Picking a proper amount of rice bacterial blight, citrus canker and kiwi canker on an NA solid culture medium, putting the rice bacterial blight, citrus canker and kiwi canker into an NB culture medium, and carrying out shake culture in a constant-temperature shaking table at 28 ℃ and 250rpm until the logarithmic phase is reserved; 4mL of NB-containing liquid medium (compound or drug) at various concentrations (e.g., 100, 50ppm) were prepared in sterilized test tubes, and 40. mu.L of the cultured pathogenic bacteria were added to each of these test tubes, and the tubes were shaken in a shaker at a constant temperature of 250rpm and 28 ℃ for about 12-24 hours. 200. mu.L of each of the bacterial solutions was removed from each test tube and used for OD measurement₅₉₅Value, simultaneously determining the OD of the sterilized NB-containing liquid medium at the corresponding concentration₅₉₅The value is obtained.

Correcting OD value, namely OD value of the bacteria-containing culture medium-OD value of the sterile culture medium;

percent inhibition is [ (OD value of control medium liquid OD value after correction-OD value of medium containing toxin corrected)/OD value of control medium liquid OD value after correction ] × 100

The examples of the present invention are given to illustrate the technical solution of the present invention, but the contents of the examples are not limited thereto, and some experimental results of the target compounds are shown in the following table.

TABLE 3 inhibitory Activity of a class of quinazolinone derivatives containing disulfide Structure against Paddy rice bacterial blight

——:low activity

TABLE 4 inhibitory Activity of a class of quinazolinone derivatives containing disulfide Structure against Leptosphaeria citricola

——:low activity

TABLE 5 inhibitory Activity of a class of quinazolinone derivatives containing disulfide Structure against Actinidia valvata Lesch

——:low activity

TABLE 6 inhibition activity of a class of disulfide structure-containing quinazolinone derivatives against ralstonia solanacearum

——:low activity

The results of the in vitro experiments show that: compared with the control drugs of bismerthiazol and shenqinmycin, the series of compounds have better inhibitory activity on rice bacterial blight, citrus canker, kiwi canker and tobacco bacterial wilt; taking the data of the inhibition activity on rice bacterial blight as an example, the inhibition effect of most compounds under the tested concentration is superior to that of bismerthiazol and is equivalent to that of shenqinmycin, wherein the inhibition effect of the compounds 1-9, 11-13, 16-17, 21 and 23 can still achieve more than 90% under the condition of lower concentration of 25ppm and is equivalent to that of shenqinmycin, and the inhibition rate of the bismerthiazol under the same concentration is only about 30%. The preliminary in vitro activity data provides better support for further research, and the series of compounds can be further subjected to in vivo experiments, structure optimization and preliminary action mechanism research so as to provide a certain basis for creating new pesticides.