JPH023787B2 - - Google Patents
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- Publication number
- JPH023787B2 JPH023787B2 JP11740980A JP11740980A JPH023787B2 JP H023787 B2 JPH023787 B2 JP H023787B2 JP 11740980 A JP11740980 A JP 11740980A JP 11740980 A JP11740980 A JP 11740980A JP H023787 B2 JPH023787 B2 JP H023787B2
- Authority
- JP
- Japan
- Prior art keywords
- general formula
- formula
- acetate
- isoxazole
- isoxazol
- 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
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- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)
Description
本発明は一般式()
で示されるイソオキサゾール酢酸又はそのエステ
ルの製造方法に関する。
ただし、上記一般式()において−
CH2CO2R1基はイソオキサゾール環の3位又は5
位に位置する。ここに、R1は水素原子;メチル
基、エチル基、プロピル基、プチル基などのアル
キル基;又はビニル基、アリル基、プレニル基、
ゲラニル基、フアルネシル基などのアルケニル基
を表わす。
一般式()で示されるイソオキサゾール酢酸
又はそのエステルは稲のイモチ病に対して優れた
坑菌活性を有し、またそのほかの多くの化合物は
稲のゴマハガレ病、モンガレ病、キユウリのウド
ンコ病、タンソ病、灰色カビ病、ベト病、いんげ
んの灰色カビ病、キンカク病などの各種の植物病
原菌に対して高い抗菌活性を示し、しかも農作物
に対して薬害がなく、農園芸用殺菌剤として有用
である。従来、ジエチル(3−ニトロプロピオニ
ル)マロネートに臭化水素を作用させることによ
りイソオキサゾール−5−イル酢酸を得る方法が
知られている〔Chem.Pharm.Bull.,14,89
(1966)参照〕が、この方法は収率が10数%と低
く経剤的な方法ではない。
本発明によれば、一般式()で示されるイソ
オキサゾール酢酸又はそのエステルは下記の方法
により容易に高収率で製造することができる。す
なわち、一般式()
〔式中、R2及びR3は同一又は異なり各々低級
アルキル基を表わす。〕で示される化合物及び/
又は一般式()
〔式中、R2及びR3は一般式()におけると
同じ意味を有する。〕で示される化合物とヒドロ
キシルアミンとを酸の存在下に反対させると一般
式(a)
〔式中、R2は一般式()におけると同じ意
味を有する。〕で示されるイソオキサゾール−3
−イル酢酸エステル及び/又は一般式(b)
〔式中、R2は一般式()におけると同じ意
味を有する。〕で示されるイソオキサゾール−5
−イル酢酸エステルが得られ、必要に応じこれを
加水分解するか又はエステル変換することにより
一般式()で示されるイソオキサゾール酢酸又
はそのエステルが得られる。
一般式()で示される化合物及び/又は一般
式()で示される化合物とヒドロキシルアミン
との反応は塩酸、硫酸、燐酸、ギ酸、酢酸、シユ
ウ酸、安息香酸、P−トルエンスルホン酸などの
無機又は有機の酸の存在下に行なわれる。なお、
ヒドロキシルアミンは酸との塩、例えば塩酸塩の
形で用いるのが簡便である。この反応は、通常、
メタノール、エタノールなどのアルコール類、テ
トラヒドロフラン、1,2−ジメトキシエタンな
どのエーテル類、ベンゼン、トルエン、キシレン
などの芳香族炭化水素、N,N−ジメチルホルム
アミド、ジメチルスルホキサイドなどの本反応に
対して不活性な溶媒の存在下又は不存在下に室温
〜150℃の温度範囲、好ましくは50℃〜120℃の温
度範囲で行なわれる。
上記の反応で得られた一般式(a)で示され
るイソオキサゾール−3−イル酢酸エステル又は
一般式(b)で示されるイソオキサゾール−5
−イル酢酸エステルは、例えば次の方法(i)〜(iii)に
より容易に加水分解又はエステル変換される。
〔式中、R2は一般式()におけると同じ意
味を有する。〕
〔式中、R4はアルキル基又はアルケニル基を
表わし、Xはハロゲン原子を表わす。〕
〔式中、R2は一般式()におけると同じ意
味を有し、R4はアルキル基又はアルケニル基を
表わす。〕
すなわち、方法(i)では、一般式(a)で示さ
れるイソオキサゾール−3−イル酢酸エステル又
は一般式(b)で示されるイソオキサゾール−
5ーイル酢酸エステルを常法に従つて水酸化カリ
ウム、水酸化ナトリウムなどのアルカリの存在下
に加水分解する。方法(ii)では、方法(i)により得ら
れたイソオキサゾール−3−イル酢酸又はイソオ
キサゾール−5−イル酢酸をまず常法によりベン
ゼン、トルエンなどの不活性溶媒中で塩化チオニ
ル、臭化チオニルなどのハロゲン化チオニルで処
理してそれぞれ対応する酸ハライドとし、ついで
これをピリジン、トリエチルアミンのような第3
級アミンの存在下にベンゼン、トルエンのような
不活性溶媒中、室温下に一般式R4OHで示される
アルコールと反応させる。方法(iii)では、一般式
(a)で示されるイソオキサゾール−3−イル
酢酸エステル又は一般式(b)で示されるイソ
オキサゾール−5−イル酢酸エステルを常法に従
いベンゼン、トルエンなどの不活性溶媒中、水酸
化カリウム、水酸化ナトリウムなどのアルカリの
存在下に一般式R4OHで示されるアルコールとと
もに加熱撹拌し、生成する低沸点アルコールを留
去しながら反応させる。
目的とするイソオキサゾール酢酸又はそのエス
テルがイソオキサゾール−3−イル酢酸又はその
エステルとイソオキサゾール−5−イル酢酸又は
そのエステルとの混合物として得られる場合、こ
の混合物を再結晶、蒸留、クロマトグラフイーな
どの通常の分離手段に供することにより容易に
個々の目的とするイソオキサゾール酢酸又はその
エステルが得られる。
本発明に用いる一般式()で示される化合物
は1−低級アルコキシ−1−プテン−3−インと
炭酸ジ低級アルキルエステルとを低級アルカノー
ル中でナトリウムアルコレートの存在下に反応さ
せることにより得られ、また一般式()で示さ
れる化合物は1−低級アルコキシ−1−プテン−
3−インと炭酸ジ低級アルキルエステルとをナト
リウムアルコレートの存在下に反応させることに
より得られる〔Ber.,89,878(1956)参照〕。
以下、本発明を実施例により説明するが、本発
明はこれらの実施例によつて何ら制限を受けるも
のではない。
実施例 1
イソオキサゾール−3−イル酢酸エチル及びイ
ソオキサゾール−5−イル酢酸エチルの合成エチ
ル3,5−ジエトキシ−2,4−ペンタジエノエ
ート0.5g、ヒドロキシルアミン塩酸塩0.2g及び濃
塩酸0.5mlをエタノール10mlに加え、1時間加熱
還流した。得られた反応液に水を加え、ついでジ
エチルエーテルで抽出した。エーテル抽出液を無
水硫酸マグネシウムで乾燥し、エーテルを留去
後、その残渣をシリカゲル薄層クロマトグラフイ
ー(溶媒:クロロホルム)で分離することにより
下記のNMRスペクトルを各々有するイソオキサ
ゾール−3−イル酢酸エチルを0.11g(収率31%)
及びイソオキサゾール−5−イル酢酸エチルを
0.24g(収率68%)得た。
The present invention is based on the general formula () The present invention relates to a method for producing isoxazole acetic acid or its ester represented by However, in the above general formula () -
CH 2 CO 2 R 1 group is the 3rd or 5th position of the isoxazole ring
position. Here, R 1 is a hydrogen atom; an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group; or a vinyl group, an allyl group, a prenyl group,
Represents an alkenyl group such as a geranyl group or a farnesyl group. Isoxazole acetic acid or its ester represented by the general formula () has excellent antibacterial activity against rice blast rot, and many other compounds are used to treat rice rot, mongal rot, cucumber powdery mildew, It exhibits high antibacterial activity against various plant pathogens such as tans, botrytis blight, downy mildew, botrytis blight of kidney beans, and kinkweed, and is useful as an agricultural and horticultural fungicide because it does not cause any phytotoxicity to agricultural crops. be. Conventionally, it has been known to obtain isoxazol-5-yl acetic acid by reacting diethyl (3-nitropropionyl) malonate with hydrogen bromide [Chem.Pharm.Bull., 14 , 89]
(1966)], but this method has a low yield of 10% and is not a pharmaceutical method. According to the present invention, isoxazole acetic acid or its ester represented by the general formula () can be easily produced in high yield by the following method. That is, the general formula () [In the formula, R 2 and R 3 are the same or different and each represents a lower alkyl group. ] and/
or general formula () [In the formula, R 2 and R 3 have the same meanings as in the general formula (). ] When the compound represented by the formula and hydroxylamine are opposed in the presence of an acid, the general formula (a) is obtained. [In the formula, R 2 has the same meaning as in the general formula (). ] Isoxazole-3 represented by
-yl acetate and/or general formula (b) [In the formula, R 2 has the same meaning as in the general formula (). ] Isoxazole-5 represented by
-ylacetic acid ester is obtained, and if necessary, this is hydrolyzed or converted into an ester to obtain isoxazole acetic acid or its ester represented by the general formula (). The reaction of the compound represented by the general formula () and/or the compound represented by the general formula () with hydroxylamine can be carried out using an inorganic acid such as hydrochloric acid, sulfuric acid, phosphoric acid, formic acid, acetic acid, oxalic acid, benzoic acid, P-toluenesulfonic acid, etc. Alternatively, it is carried out in the presence of an organic acid. In addition,
Hydroxylamine is conveniently used in the form of a salt with an acid, such as a hydrochloride. This reaction is usually
For this reaction, alcohols such as methanol and ethanol, ethers such as tetrahydrofuran and 1,2-dimethoxyethane, aromatic hydrocarbons such as benzene, toluene, and xylene, N,N-dimethylformamide, and dimethyl sulfoxide, etc. The reaction is carried out in the presence or absence of an inert solvent at a temperature ranging from room temperature to 150°C, preferably from 50°C to 120°C. Isoxazol-3-yl acetate represented by general formula (a) or isoxazole-5 represented by general formula (b) obtained by the above reaction
-yl acetate is easily hydrolyzed or ester-converted, for example, by the following methods (i) to (iii). [In the formula, R 2 has the same meaning as in the general formula (). ] [In the formula, R 4 represents an alkyl group or an alkenyl group, and X represents a halogen atom. ] [In the formula, R 2 has the same meaning as in the general formula (), and R 4 represents an alkyl group or an alkenyl group. ] That is, in method (i), isoxazol-3-yl acetate represented by general formula (a) or isoxazole-3-yl acetate represented by general formula (b)
5-yl acetate is hydrolyzed in the presence of an alkali such as potassium hydroxide or sodium hydroxide according to a conventional method. In method (ii), isoxazol-3-yl acetic acid or isoxazol-5-yl acetic acid obtained by method (i) is first treated with thionyl chloride or thionyl bromide in an inert solvent such as benzene or toluene by a conventional method. The corresponding acid halides are treated with thionyl halides such as
The reaction mixture is reacted with an alcohol represented by the general formula R 4 OH in the presence of a class amine in an inert solvent such as benzene or toluene at room temperature. In method (iii), isoxazol-3-yl acetate represented by general formula (a) or isoxazol-5-yl acetate represented by general formula (b) is treated with an inert solution such as benzene or toluene according to a conventional method. The mixture is heated and stirred with an alcohol represented by the general formula R 4 OH in a solvent in the presence of an alkali such as potassium hydroxide or sodium hydroxide, and the reaction is allowed to occur while distilling off the low-boiling alcohol produced. When the desired isoxazole acetic acid or its ester is obtained as a mixture of isoxazole-3-yl acetic acid or its ester and isoxazole-5-yl acetic acid or its ester, this mixture is subjected to recrystallization, distillation, and chromatography. The desired isoxazole acetic acid or ester thereof can be easily obtained by subjecting it to conventional separation means such as . The compound represented by the general formula () used in the present invention can be obtained by reacting 1-lower alkoxy-1-puten-3-yne and di-lower alkyl carbonate in a lower alkanol in the presence of sodium alcoholate. , and the compound represented by the general formula () is 1-lower alkoxy-1-butene-
It is obtained by reacting 3-yne and di-lower alkyl carbonate in the presence of sodium alcoholate [see Ber., 89 , 878 (1956)]. EXAMPLES The present invention will be explained below with reference to Examples, but the present invention is not limited in any way by these Examples. Example 1 Synthesis of ethyl isoxazol-3-yl acetate and ethyl isoxazol-5-yl acetate 0.5 g of ethyl 3,5-diethoxy-2,4-pentadienoate, 0.2 g of hydroxylamine hydrochloride and 0.5 g of concentrated hydrochloric acid. ml was added to 10 ml of ethanol, and the mixture was heated under reflux for 1 hour. Water was added to the resulting reaction solution, and then extracted with diethyl ether. The ether extract was dried over anhydrous magnesium sulfate, the ether was distilled off, and the residue was separated using silica gel thin layer chromatography (solvent: chloroform) to obtain isoxazol-3-yl acetic acid having the following NMR spectra. 0.11g of ethyl (31% yield)
and ethyl isoxazol-5-yl acetate
0.24g (yield 68%) was obtained.
【表】
実施例 2
イソオキサゾール−3−イル酢酸エチル及びイ
ソオキサゾール−5−イル酢酸エチルの合成エチ
ル3,5,5−トリエトキシ−2−ペンテノエー
ト0.5g、ヒドロキシルアミン塩酸塩0.2g及び濃塩
酸0.5mlをエタノール10mlに加え、1時間加熱還
流した。得られた反応液に水を加え、ついでジエ
チルエーテルで抽出した。エーテル抽出液を無水
硫酸マグネシウムで乾燥し、エーテルを留去後、
その残渣をシリカゲル薄層クロマトグラフイー
(溶媒:クロロホルム)で分離することにより、
イソオキサゾール−3−イル酢酸エチルを0.1g
(収率34%)及びイソオキサゾール−5−イル酢
酸エチルを0.19g(収率65%)得た。
実施例 3
イソオキサゾール−5−イル酢酸及びイソオキ
サゾール−5−イル酢酸ゲラニルの合成
イソオキサゾール−5−イル酢酸エチル3.2g及
び水酸化ナトリウム2gを水10mlとエタノール20
mlの混合溶液に加え、室温で一夜攬拌した。得ら
れた反応液を水100mlにあけ、それに希塩酸を加
えて酸性とした。析出した結晶をロ別し、ベンゼ
ン−n−ヘキサンの混合液で再結晶して白色結晶
のイソオキサゾール−5−イル酢酸(mp.102〜
103℃、文献値104〜104.5℃)を1.9g得た。
イソオキサゾール−5−イル酢酸1.9g及び塩化
チオニル5.3gをベンゼン50mlに加え、8時間加熱
還流した。得られた反応液からベンゼン及び過剰
の塩化チオニルを留去し、その残渣にゲラニオー
ル2.3g、ピリジン9g及びベンゼン50mlを加え、
室温で一夜攬拌した。得られた反応液に水100ml
及びジエチルエーテル50mlを加えて抽出した。エ
ーテル抽出液を無水硫酸マグネシウムで乾燥し、
エーテルを留去後、その残渣をシリカゲルクロマ
トグラフイーで分離精製することにより下記の
NMRスペクトルを有する油状のイソオキサゾー
ル−5−イル酢酸ゲラニルを1.2g得た。
NMRスペクトル(CDCl)δ:
1.49(3H,s),1.58(6H,s),1.95(4H,
m),3.73(2H,s),4.56(2H,d,J=7
Hz),4.98(1H,m),5.24(1H,t,J=7
Hz),6.17(1H,d,J=1Hz),8.08(1H,
d,J=1Hz)。[Table] Example 2 Synthesis of ethyl isoxazol-3-yl acetate and ethyl isoxazol-5-yl acetate 0.5 g of ethyl 3,5,5-triethoxy-2-pentenoate, 0.2 g of hydroxylamine hydrochloride and 0.5 g of concentrated hydrochloric acid ml was added to 10 ml of ethanol, and the mixture was heated under reflux for 1 hour. Water was added to the resulting reaction solution, and then extracted with diethyl ether. After drying the ether extract with anhydrous magnesium sulfate and distilling off the ether,
By separating the residue using silica gel thin layer chromatography (solvent: chloroform),
0.1g of ethyl isoxazol-3-yl acetate
(yield: 34%) and 0.19 g (yield: 65%) of ethyl isoxazol-5-yl acetate. Example 3 Synthesis of isoxazol-5-yl acetic acid and geranyl isoxazol-5-yl acetate 3.2 g of ethyl isoxazol-5-yl acetate and 2 g of sodium hydroxide were mixed with 10 ml of water and 20 ml of ethanol.
ml of the mixed solution and stirred overnight at room temperature. The obtained reaction solution was poured into 100 ml of water, and diluted hydrochloric acid was added thereto to make it acidic. The precipitated crystals were filtered and recrystallized from a benzene-n-hexane mixture to give white crystals of isoxazol-5-yl acetic acid (mp.102~
103°C, literature value 104-104.5°C) was obtained. 1.9 g of isoxazol-5-yl acetic acid and 5.3 g of thionyl chloride were added to 50 ml of benzene, and the mixture was heated under reflux for 8 hours. Benzene and excess thionyl chloride were distilled off from the resulting reaction solution, and 2.3 g of geraniol, 9 g of pyridine and 50 ml of benzene were added to the residue.
Stir overnight at room temperature. Add 100ml of water to the resulting reaction solution.
and 50 ml of diethyl ether were added for extraction. The ether extract was dried with anhydrous magnesium sulfate,
After distilling off the ether, the residue was separated and purified using silica gel chromatography to obtain the following.
1.2 g of oily isoxazol-5-ylgeranyl acetate having an NMR spectrum was obtained. NMR spectrum (CDCl) δ: 1.49 (3H, s), 1.58 (6H, s), 1.95 (4H,
m), 3.73 (2H, s), 4.56 (2H, d, J=7
Hz), 4.98 (1H, m), 5.24 (1H, t, J=7
Hz), 6.17 (1H, d, J = 1Hz), 8.08 (1H,
d, J = 1Hz).
Claims (1)
アルキル基を表わす。〕で示される化合物及び/
又は一般式() 〔式中、R2及びR3は一般式()におけると
同じ意味を有する。〕で示される化合物とヒドロ
キシルアミンとを酸の存在下に反応させることに
より一般式(a) 〔式中、R2は一般式()におけると同じ意
味を有する。〕で示されるイソオキサゾ−ル−3
−イル酢酸エステル及び/又は一般式(b) 〔式中、R2は一般式()におけると同じ意
味を有する。〕で示されるイソオキサゾ−ル−5
−イル酢酸エステルを得、必要によりこれを加水
分解するか又はエステル変換することを特徴とす
る一般式() 〔式中、−CH2CO2R1基はイソオキサゾール環
の3位又は5位に位置し、R1は水素原子、アル
キル基又はアルケニル基を表わす。〕で示される
イソオキサゾール酢酸又はそのエステルの製造方
法。[Claims] 1 General formula () [In the formula, R 2 and R 3 are the same or different and each represents a lower alkyl group. ] and/
or general formula () [In the formula, R 2 and R 3 have the same meanings as in the general formula (). ] By reacting the compound represented by the formula with hydroxylamine in the presence of an acid, the compound represented by the general formula (a) [In the formula, R 2 has the same meaning as in the general formula (). ] Isoxazole-3 represented by
-yl acetate and/or general formula (b) [In the formula, R 2 has the same meaning as in the general formula (). ] Isoxazole-5 represented by
General formula () characterized in that -yl acetate is obtained, and if necessary, it is hydrolyzed or ester-converted. [In the formula, the -CH 2 CO 2 R 1 group is located at the 3rd or 5th position of the isoxazole ring, and R 1 represents a hydrogen atom, an alkyl group, or an alkenyl group. ] A method for producing isoxazole acetic acid or its ester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11740980A JPS5740477A (en) | 1980-08-25 | 1980-08-25 | Preparation of isoxazoleacetic acid or ester thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11740980A JPS5740477A (en) | 1980-08-25 | 1980-08-25 | Preparation of isoxazoleacetic acid or ester thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5740477A JPS5740477A (en) | 1982-03-06 |
| JPH023787B2 true JPH023787B2 (en) | 1990-01-24 |
Family
ID=14710927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11740980A Granted JPS5740477A (en) | 1980-08-25 | 1980-08-25 | Preparation of isoxazoleacetic acid or ester thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5740477A (en) |
-
1980
- 1980-08-25 JP JP11740980A patent/JPS5740477A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5740477A (en) | 1982-03-06 |
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