JP3787821B2 - Method for producing benzamidoxime compound - Google Patents
Method for producing benzamidoxime compound Download PDFInfo
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- JP3787821B2 JP3787821B2 JP09044596A JP9044596A JP3787821B2 JP 3787821 B2 JP3787821 B2 JP 3787821B2 JP 09044596 A JP09044596 A JP 09044596A JP 9044596 A JP9044596 A JP 9044596A JP 3787821 B2 JP3787821 B2 JP 3787821B2
- Authority
- JP
- Japan
- Prior art keywords
- group
- formula
- producing
- cyclopropylmethyl
- compound represented
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 0 CC(c1c(*)c(*)c(C)c(C)c1*)=N Chemical compound CC(c1c(*)c(*)c(C)c(C)c1*)=N 0.000 description 2
Description
【0001】
【発明の属する技術分野】
本発明は、農園芸用殺菌剤の中間体として有用なベンズアミドキシム化合物を工業的に有利に製造する方法に関する。
【0002】
【従来の技術】
式〔III 〕
【0003】
【化3】
【0004】
で表される化合物は、農園芸用殺菌剤として有用である。従来、この化合物の製造は、式〔I〕
【0005】
【化4】
【0006】
で表わされる化合物に、塩基の存在下に臭素化シクロプロピルメチルを反応させて製造していた。
【0007】
【発明が解決しようとする課題】
しかしながら、臭素化シクロプロピルメチルを用いる方法では、臭素化シクロプロピルメチルの反応性が悪いために、シクロプロピルメチル化の収率が悪く、工業的生産を行う上での支障となっていた。
本発明は、かかる問題点を解決すべく、工業的に有利に、シクロプロピルメチル化反応を行わせる技術を提供することを目的とする。
【0008】
【課題を解決するための手段】
本発明は、式〔I〕
【0009】
【化5】
【0010】
で表わされる化合物を、塩基の存在下に、ヨウ化シクロプロピルメチルを反応させることを特徴とする、式〔II〕
【0011】
【化6】
【0012】
で表わされるベンズアミドキシム化合物の製造方法である。
上記において、X1 ,X5 は、それぞれメチル、エチル、プロピル、イソプロピル、n−ブチル、イソブチル、t−ブチル、ペンチル、ヘキシル基等の直鎖若しくは分岐のC1-6 アルキル基、トリフルオロメチル、トリフルオロエチル、ペンタフルオロエチル、ジフルオロメチル、トリクロロメチル、クロロメチル、ジクロロメチル基等のC1-6 ハロアルキル基、フッ素、塩素、臭素、ヨウ素等のハロゲン原子を表す。
X2 ,X3 ,X4 は、それぞれ水素原子、メチル、エチル、プロピル、イソプロピル、n−ブチル、イソブチル、t−ブチル、ペンチル、ヘキシル基等の直鎖若しくは分岐のC1-6 アルキル基、トリフルオロメチル、トリフルオロエチル、ペンタフルオロエチル、ジフルオロメチル、クロロメチル、トリクロロメチル、ジクロロメチル基等のC1-6 ハロアルキル基、フッ素、塩素、臭素、ヨウ素等のハロゲン原子、ニトロ基、シアノ基、又は、メトキシ、エトキシ、プロポキシ、イソプロポキシ、ブトキシ、t−ブトキシ基等のC1-6 アルコキシ基を表す。
【0013】
本発明の製造プロセスを下記に示す。
【0014】
【化7】
【0015】
すなわち、式〔I〕で表される化合物を、不活性溶媒中、塩基の存在の下に、ヨウ化シクロプロピルメチルを反応させることにより、O−シクロプロピルメチル化を行わせしめるものである。
【0016】
ここで、反応に用いられる溶媒としては、ベンゼン、トルエン等の芳香族炭化水素、THF、ジエチルエーテル等のエーテル類、アセトン、メチルエチルケトン等のケトン類、DMF、DMA等のアミド類、DMSO、アセトニトリル、水等が挙げられ、より好ましい溶媒としては、DMF、DMAである。また、これらの溶媒は、単独であるいは数種の混合で用いることができる。
【0017】
反応に用いられる塩基としては、ナトリウムメトキシド、ナトリウムエトキシド等の金属アルコキシド、水素化ナトリウムなどの水素化物、水酸化ナトリウム、水酸化カリウムなどの水酸化物、炭酸カリウム、炭酸ナトリウムなどの炭酸塩、炭酸水素ナトリウム等の炭酸水素塩、トリエチルアミン、ピリジン等の有機塩基等を例示することができる。
【0018】
また溶媒系および塩基によっては、以下の触媒を用いることができる。触媒として、18−クラウン−6、ジシクロヘキシル−18−クラウン−6などの各エーテル類、テトラブチルアンモニウムブロマイド、そのクロライド、メチルトリオクチルアンモニウムクロライド、ベンジルトリブチルアンモニウムブロマイド、ベンジルトリエチルアンモニウムクロライドなどの第4級アンモニウム塩、テトラフェニルホスホニウムブロマイド、ヘキサデシルトリブチルホスホニウムアイオダイドなどのホスホニウム化合物が挙げられる。
【0019】
反応は−15℃から用いられる溶媒の沸点までの温度範囲で10分から数10時間反応させる。反応終了後は、通常の合成化学的手法により後操作を行う、目的物〔II〕を効率よく得ることができる。反応生成物は、NMR、MASS、IRスペクトル等により、その構造を確認できる。
【0020】
【実施例】
次に、実施例により本発明をさらに詳細に説明する。
(実施例1)N’−シクロプロピルメチルオキシ−2,3−ジフルオロ−6−トリフルオロメチルベンズアミジンの製造(その1)
【0021】
【化8】
【0022】
2,3−ジフルオロ−6−トリフルオロメチルベンズアミドキシム 10.0g(41.7mmol)をN,N−ジメチルホルムアキド(DMF)100mlに溶解後、寒剤で−12℃まで冷却し、ヨウ化シクロプロピルメチル9.8g(53.8mmol)を添加した。次いで、水酸化カリウム水溶液(KOH3g/水3ml)を−10℃〜−12℃で30分かけて滴下し、同温度でさらに5時間攪拌した。反応液を氷水に注加後、濃塩酸でpHを7とし、酢酸エチルで抽出し、有機層を水洗し無水硫酸マグネシウムで乾燥した。溶媒を減圧留去し、残渣をシリカゲルカラムクロマトグラフィーにて精製して、目的物10.5gを得た。収率 85.6% 融点 48−49℃
【0023】
(実施例2)N’−シクロプロピルメチルオキシ−2,3−ジフルオロ−6−トリフルオロメチルベンズアミジンの製造(その2)
2,3−ジフルオロ−6−トリフルオロメチルベンズアミドキシム 293g(1.22mol)をDMF2.9リットルに溶解後、寒剤で−15℃まで冷却し、ヨウ化シクロプロピルメチル327g(1.8mol)を添加した。次いで、粉末状の水酸化カリウム96.5g(1.5mol)を4分割して、約1.5時間かけて添加し、添加終了後さらに、−8℃〜−10℃で1.5時間攪拌した。反応液を氷水に注加した後、濃塩酸でpHを7とし、酢酸エチルで抽出し、有機層を無水硫酸マグネシウムで乾燥した。溶媒を減圧留去し、残渣をシリカゲルカラムクロマトグラフィーにて精製して、目的物322gを得た。収率 89.7%
【0024】
(比較例1)N’−シクロプロピルメチルオキシ−2,3−ジフルオロ−6−トリフルオロメチルベンズアミジンの製造(臭素化シクロプロピルメチルを用いる方法)
【0025】
【化9】
【0026】
2,3−ジフルオロ−6−トリフルオロメチルベンズアミドキシム 1.2g(5.0mmol)をDMF12mlに溶解後、寒剤で−10℃まで冷却し、臭素化シクロプロピルメチル1.0g(7.5mmol)を添加した。次いで、粉末の水酸化カリウム 0.4gを−5℃〜−10℃で30分かけて滴下し、同温度でさらに5時間攪拌した。反応液を氷水に注加後、濃塩酸でpHを7とし、酢酸エチルで抽出し、有機層を水洗し無水硫酸マグネシウムで乾燥した。溶媒を減圧留去し、残渣をシリカゲルカラムクロマトグラフィーにて精製して、目的物0.66gを得た。収率 45.0%
【0027】
本発明の製造法に従って製造される式〔II〕で表わされる化合物のいくつかの例を表1にまとめた。
【0028】
【表1】
【0029】
【発明の効果】
以上説明したように、本発明はヨウ化シクロプロピルメチルを使用することに特徴を有するものであり、本発明の方法によれば農園芸用殺菌剤の中間体であるベンズアミドキシム化合物を工業的にきわめて有利に製造することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for industrially advantageously producing a benzamidoxime compound useful as an intermediate for agricultural and horticultural fungicides.
[0002]
[Prior art]
Formula [III]
[0003]
[Chemical 3]
[0004]
Are useful as agricultural and horticultural fungicides. Conventionally, the preparation of this compound has the formula [I]
[0005]
[Formula 4]
[0006]
It was manufactured by reacting a brominated cyclopropylmethyl with the compound represented by the above in the presence of a base.
[0007]
[Problems to be solved by the invention]
However, in the method using brominated cyclopropylmethyl, since the reactivity of brominated cyclopropylmethyl is poor, the yield of cyclopropylmethylation is poor, which hinders industrial production.
An object of the present invention is to provide a technique for performing a cyclopropylmethylation reaction in an industrially advantageous manner to solve such problems.
[0008]
[Means for Solving the Problems]
The present invention relates to the formula [I]
[0009]
[Chemical formula 5]
[0010]
Wherein the compound represented by the formula (II) is reacted with cyclopropylmethyl iodide in the presence of a base.
[0011]
[Chemical 6]
[0012]
A method for producing a benzamidoxime compound represented by the formula:
In the above, X 1 and X 5 are each a linear or branched C 1-6 alkyl group such as methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, t-butyl, pentyl, hexyl group, trifluoromethyl, etc. Represents a C 1-6 haloalkyl group such as trifluoroethyl, pentafluoroethyl, difluoromethyl, trichloromethyl, chloromethyl and dichloromethyl groups, and a halogen atom such as fluorine, chlorine, bromine and iodine.
X 2 , X 3 and X 4 are each a hydrogen atom, a straight or branched C 1-6 alkyl group such as methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, t-butyl, pentyl, hexyl group, C 1-6 haloalkyl groups such as trifluoromethyl, trifluoroethyl, pentafluoroethyl, difluoromethyl, chloromethyl, trichloromethyl, dichloromethyl groups, halogen atoms such as fluorine, chlorine, bromine, iodine, nitro groups, cyano groups Or a C 1-6 alkoxy group such as methoxy, ethoxy, propoxy, isopropoxy, butoxy, t-butoxy group and the like.
[0013]
The manufacturing process of the present invention is shown below.
[0014]
[Chemical 7]
[0015]
That is, O-cyclopropylmethylation is carried out by reacting the compound represented by the formula [I] with cyclopropylmethyl iodide in the presence of a base in an inert solvent.
[0016]
Here, as a solvent used for the reaction, aromatic hydrocarbons such as benzene and toluene, ethers such as THF and diethyl ether, ketones such as acetone and methyl ethyl ketone, amides such as DMF and DMA, DMSO, acetonitrile, Water and the like can be mentioned, and more preferred solvents are DMF and DMA. These solvents can be used alone or in combination of several kinds.
[0017]
Examples of the base used in the reaction include metal alkoxides such as sodium methoxide and sodium ethoxide, hydrides such as sodium hydride, hydroxides such as sodium hydroxide and potassium hydroxide, carbonates such as potassium carbonate and sodium carbonate. Examples thereof include hydrogen carbonates such as sodium hydrogen carbonate and organic bases such as triethylamine and pyridine.
[0018]
Depending on the solvent system and base, the following catalysts can be used. Catalysts such as 18-crown-6, dicyclohexyl-18-crown-6 and other ethers, tetrabutylammonium bromide, its chloride, methyltrioctylammonium chloride, benzyltributylammonium bromide, benzyltriethylammonium chloride and the like quaternary Examples thereof include phosphonium compounds such as ammonium salt, tetraphenylphosphonium bromide, and hexadecyltributylphosphonium iodide.
[0019]
The reaction is carried out in the temperature range from −15 ° C. to the boiling point of the solvent used for 10 minutes to several tens of hours. After completion of the reaction, the desired product [II] can be efficiently obtained by post-operation by a usual synthetic chemical method. The structure of the reaction product can be confirmed by NMR, MASS, IR spectrum and the like.
[0020]
【Example】
Next, the present invention will be described in more detail with reference to examples.
Example 1 Production of N′-cyclopropylmethyloxy-2,3-difluoro-6-trifluoromethylbenzamidine (Part 1)
[0021]
[Chemical 8]
[0022]
After dissolving 10.0 g (41.7 mmol) of 2,3-difluoro-6-trifluoromethylbenzamidoxime in 100 ml of N, N-dimethylformamide (DMF), the solution was cooled to −12 ° C. with a cryogen and cyclopropyl iodide was added. Methyl 9.8 g (53.8 mmol) was added. Next, an aqueous potassium hydroxide solution (KOH 3 g / water 3 ml) was added dropwise at −10 ° C. to −12 ° C. over 30 minutes, and the mixture was further stirred at the same temperature for 5 hours. The reaction solution was poured into ice water, adjusted to pH 7 with concentrated hydrochloric acid, extracted with ethyl acetate, the organic layer was washed with water and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography to obtain 10.5 g of the desired product. Yield 85.6% Melting point 48-49 ° C
[0023]
(Example 2) Production of N'-cyclopropylmethyloxy-2,3-difluoro-6-trifluoromethylbenzamidine (Part 2)
293 g (1.22 mol) of 2,3-difluoro-6-trifluoromethylbenzamidoxime was dissolved in 2.9 liters of DMF, cooled to −15 ° C. with a cryogen, and 327 g (1.8 mol) of cyclopropylmethyl iodide was added. did. Next, 96.5 g (1.5 mol) of powdered potassium hydroxide was divided into four portions and added over about 1.5 hours. After the addition was completed, the mixture was further stirred at −8 ° C. to −10 ° C. for 1.5 hours. did. The reaction solution was poured into ice water, adjusted to pH 7 with concentrated hydrochloric acid, extracted with ethyl acetate, and the organic layer was dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography to obtain 322 g of the desired product. Yield 89.7%
[0024]
Comparative Example 1 Production of N′-cyclopropylmethyloxy-2,3-difluoro-6-trifluoromethylbenzamidine (method using brominated cyclopropylmethyl)
[0025]
[Chemical 9]
[0026]
After dissolving 1.2 g (5.0 mmol) of 2,3-difluoro-6-trifluoromethylbenzamidoxime in 12 ml of DMF, the solution was cooled to −10 ° C. with a cryogen, and 1.0 g (7.5 mmol) of brominated cyclopropylmethyl was added. Added. Next, 0.4 g of powdered potassium hydroxide was added dropwise at −5 ° C. to −10 ° C. over 30 minutes, and the mixture was further stirred at the same temperature for 5 hours. The reaction solution was poured into ice water, adjusted to pH 7 with concentrated hydrochloric acid, extracted with ethyl acetate, the organic layer was washed with water and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography to obtain 0.66 g of the desired product. Yield 45.0%
[0027]
Table 1 summarizes some examples of the compound represented by the formula [II] produced according to the production method of the present invention.
[0028]
[Table 1]
[0029]
【The invention's effect】
As described above, the present invention is characterized by using cyclopropylmethyl iodide. According to the method of the present invention, a benzamidoxime compound, which is an intermediate of an agricultural and horticultural fungicide, is industrially produced. It can be produced very advantageously.
Claims (1)
で表わされる化合物を、塩基の存在下、ヨウ化シクロプロピルメチルを反応させることを特徴とする、式〔II〕
Wherein the compound represented by the formula (II) is reacted with cyclopropylmethyl iodide in the presence of a base.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP09044596A JP3787821B2 (en) | 1996-03-19 | 1996-03-19 | Method for producing benzamidoxime compound |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP09044596A JP3787821B2 (en) | 1996-03-19 | 1996-03-19 | Method for producing benzamidoxime compound |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09255648A JPH09255648A (en) | 1997-09-30 |
JP3787821B2 true JP3787821B2 (en) | 2006-06-21 |
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Application Number | Title | Priority Date | Filing Date |
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JP09044596A Expired - Lifetime JP3787821B2 (en) | 1996-03-19 | 1996-03-19 | Method for producing benzamidoxime compound |
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JP (1) | JP3787821B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0941988A3 (en) * | 1998-03-10 | 2000-09-20 | Basf Aktiengesellschaft | Benzamidoxime derivatives, intermediates and process for their preparation and their use as fungicides |
-
1996
- 1996-03-19 JP JP09044596A patent/JP3787821B2/en not_active Expired - Lifetime
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