JP3833281B2 - 2,6-dichloroisonicotinic acid benzylamide derivative and plant disease control agent - Google Patents

2,6-dichloroisonicotinic acid benzylamide derivative and plant disease control agent Download PDF

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Publication number
JP3833281B2
JP3833281B2 JP01691095A JP1691095A JP3833281B2 JP 3833281 B2 JP3833281 B2 JP 3833281B2 JP 01691095 A JP01691095 A JP 01691095A JP 1691095 A JP1691095 A JP 1691095A JP 3833281 B2 JP3833281 B2 JP 3833281B2
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Prior art keywords
group
lower alkyl
alkyl group
acid benzylamide
hydrogen atom
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JP01691095A
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JPH08208615A (en
Inventor
宏幸 坪井
仁 近藤
信行 吉岡
亨 朝田
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Nippon Soda Co Ltd
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Nippon Soda Co Ltd
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Description

【0001】
【産業上の利用分野】
本発明は、2,6−ジクロロイソニコチン酸ベンジルアミド誘導体に関し、当該誘導体は、植物病害防除剤として用いることができる。
【0002】
【従来の技術】
イソニコチン酸誘導体に関する農業用殺菌剤としては、例えば特開昭63−93766号に、2,6−ジハロゲン化イソニコチン酸及びそのエステル誘導体等が植物病害防除剤として有効であることが開示されている。
【0003】
【発明が解決しようとする課題】
しかしながら上記の化合物においては、保護すべき植物体に薬害が生ずる場合があり、植物に対してより安全な薬剤が求められていた。
【0004】
【課題を解決するための手段】
本発明者等は、かかる課題を解決するため種々検討した結果、一般式(1)で示される2,6−ジクロロイソニコチン酸ベンジルアミド誘導体が植物に対する薬害の心配がなく、優れた植物病害防除活性を示すことを見いだし、本発明を完成するに至った。
【0005】
即ち、本発明は下記一般式(1)
【0006】
【化2】

Figure 0003833281
【0007】
(式中、R1は水素原子、低級アルキル基又はアラルキル基を表し、R2及びR3はそれぞれ独立に水素原子、低級アルキル基又はシアノ基を表し、R4及びR5はそれぞれ独立に水素原子、低級アルキル基、低級アルコキシ基、アミノ基、低級アルキル基置換アミノ基、ニトロ基、シアノ基、ハロゲン原子、ハロゲン置換低級アルキル基又はハロゲン置換低級アルコキシ基を表す。また、R1とR4、R2とR3、R2とR4又はR4とR5は、共に環を形成することもできる。)で示される2,6−ジクロロイソニコチン酸ベンジルアミド誘導体、及びこれを有効成分とする植物病害防除剤に関するものである。
【0008】
一般式(1)において、R1は、水素原子、低級アルキル基又はアラルキル基を表し、低級アルキル基としては、直鎖状でも分岐状でも環状でも良く、例えばメチル基、エチル基、n−プロピル基、イソプロピル基、n−ブチル基、イソブチル基、2−ブチル基、ターシャリーブチル基、シクロプロピル基等の炭素数1〜4のものが、またアラルキル基としては、ベンジル基、フェニルエチル基、ピリジルメチル基、フリルメチル基、チエニルメチル基、5−メチル−2−フリルメチル基、5−ニトロ−2−フリルメチル基、テトラヒドロフリルメチル基等がそれぞれ挙げられる。R1として好ましいものは、水素原子、炭素数1〜2の低級アルキル基、フリルメチル基等である。
【0009】
2及びR3はそれぞれ独立に水素原子、低級アルキル基又はシアノ基を表し、低級アルキル基としては、直鎖状でも分岐状でも環状でも良く、例えばメチル基、エチル基、n−プロピル基、イソプロピル基、n−ブチル基、イソブチル基、2−ブチル基、ターシャリーブチル基、シクロプロピル基等の炭素数1〜4のものが挙げられる。また、R2はR3とともにシクロペンチル環、シクロヘキシル環等の環を形成していても良い。R2として好ましいものは、水素原子又は低級アルキル基であり、特に好ましくは炭素数1〜2の低級アルキル基である。R3として好ましいものは、水素原子又は低級アルキル基であり、特に好ましくは水素原子である。
【0010】
4及びR5はそれぞれ独立に水素原子、低級アルキル基、低級アルコキシ基、アミノ基、低級アルキル基置換アミノ基、ニトロ基、シアノ基、ハロゲン原子、ハロゲン置換低級アルキル基又はハロゲン置換低級アルコキシ基を表し、低級アルキル基としては、直鎖状でも分岐状でも良く、例えばメチル基、エチル基、n−プロピル基、イソプロピル基、n−ブチル基、イソブチル基、2−ブチル基、ターシャリーブチル基等の炭素数1〜4のものが、低級アルコキシ基としては、メトキシ基、エトキシ基、n−プロポキシ基等の炭素数1〜3のものが、低級アルキル基置換アミノ基としては、アミノ基の水素原子がR4で定義された炭素数1〜4の低級アルキル基で置換されたもの、例えばジメチルアミノ基、ジエチルアミノ基等の二置換化合物、メチルアミノ基、エチルアミノ基等の一置換化合物がそれぞれ挙げられ、またハロゲン原子としては弗素、塩素、臭素、ヨウ素が、ハロゲン置換低級アルキル基としては、R4で定義された炭素数1〜4の低級アルキル基にハロゲン原子が1〜5個置換した化合物、例えばトリフルオロメチル基、トリクロロメチル基、ジフルオロメチル基、ペンタフルオロエチル基等がそれぞれ挙げられる。
【0011】
また、R4は、
▲1▼R1とともにテトラヒドロイソキノリン等の環を、
▲2▼R2とともにベンゼン環と縮合したインダン、或いはテトラリン等の環を、
▲3▼R5とともにメチレンジオキシ基等の環を、
形成することができる。
【0012】
4として好ましいものは、水素原子、低級アルキル基(特に炭素数1〜2のアルキル基)、低級アルコキシ基(特に炭素数1〜2のアルコキシ基)、低級アルキル基置換アミノ基(特に炭素数1〜2のアルキル基の二置換化合物)、ニトロ基、ハロゲン原子(特にフッ素又は塩素)、ハロゲン置換低級アルキル基(特にハロゲン原子が1〜3個置換した炭素数1〜3のアルキル基)が挙げられ、またR5とし好ましいものは水素原子又は低級アルコキシ基が挙げられ、特に好ましくは水素原子が挙げられる。
【0013】
尚、一般式(1)で示される化合物の具体的構造を例示すれば、表1の通りである。
【0014】
【表1】
Figure 0003833281
【0015】
【表2】
Figure 0003833281
【0016】
【表3】
Figure 0003833281
【0017】
【表4】
Figure 0003833281
【0018】
【表5】
Figure 0003833281
【0019】
本発明における前記一般式(1)で示される化合物は、例えば下記の方法で製造することができる。但し、当該化合物は、これらの製造法に限定されるものではない。
【0020】
【化3】
Figure 0003833281
【0021】
即ち、式(2)で示される2,6−ジクロロイソニコチン酸クロリドを適当な溶媒中、必要に応じて塩基を存在させ、一般式(3)で示されるベンジルアミン誘導体と反応させることにより、一般式(1)で示される2,6−ジクロロイソニコチン酸ベンジルアミド誘導体が製造できる。
【0022】
反応溶媒としては、テトラヒドロフラン等のエーテル類、クロロホルム、ジクロロエタン等のハロゲン化炭化水素類、N,N−ジメチルホルムアミド、ジメチルスルホキシド等の非プロトン性極性溶媒等が挙げられる。塩基としてはトリエチルアミン、ジイソプロピルエチルアミン、ピリジン、4−ジメチルアミノピリジン、ジアザビシクロウンデセン等の有機塩基、水酸化ナトリウム、水酸化カリウム等の水酸化物、炭酸カリウム、炭酸セシウム等の炭酸塩等が使用できる。反応温度は、溶媒、塩基等により異なるが、通常−10〜80℃が好ましく、特に0〜50℃が好ましい。反応時間は、反応温度、溶媒、塩基等により異なるが、通常0.1〜10時間であり、好ましくは0.5〜5時間である。
【0023】
また、一般式(3)で示される化合物の中で、R1がアラルキル基のものについては、例えば下記の方法で製造することができる。但し、当該化合物は、これらの製造法に限定されるものではない。
【0024】
【化4】
Figure 0003833281
【0025】
(式中、R6はアリール基又はアラルキル基を表し、R6CH2はR1を表す。)
即ち、一般式(4)で示されるアルデヒドと、一般式(5)で示されるベンジルアミン誘導体とを脱水縮合反応させて、一般式(6)で示されるシッフ塩基とし、更にこれを適当な還元試薬を用いて還元し、一般式(3)で示される化合物を得ることができる。
【0026】
本発明に係る2,6−ジクロロイソニコチン酸ベンジルアミド誘導体を有効成分とする植物病害防除剤は、植物病原ウィルス、細菌及び糸状菌による各種の植物病害防除、例えばイネの主要病害であるいもち病、きゆうりの斑点病等に適用し得るが、特にいもち病に優れた効果を示す。
【0027】
本薬剤は、有効成分を単独で使用することも可能であるが、通常、農薬の製剤に用いられる固体及び液体坦体、並びに分散剤、希釈剤、乳化剤、展着剤、増粘剤等の補助剤と混合して、水和剤、液剤、油剤、粉剤、粒剤、ゾル剤(フロアブル)等の剤型に製剤して使用することができる。
【0028】
固体及び液体坦体としては、例えばタルク、クレー、ベントナイト、カオリン、けいそう土、モンモリロナイト、雲母、バーミキュライト、石膏、炭酸カルシウム、ホワイトカーボン、木粉、澱粉、アルミナ、珪酸塩、糖重合体、ワックス類、水、アルコール類(メチルアルコール、エチルアルコール、n−プロピルアルコール、イソプロピルアルコール、n−ブチルアルコール、エチレングリコール、ベンジルアルコール等)、石油溜分(石油エーテル、ケロシン、ソルベントナフサ等)、脂肪族又は脂環式炭化水素類(n−ヘキサン、シクロヘキサン等)、芳香族炭化水素類(ベンゼン、トルエン、キシレン、エチルベンゼン、クロロベンゼン、クメン、メチルナフタレン等)、ハロゲン化炭化水素類(クロロホルム、ジクロロメタン等)、エーテル類(イソプロピルエーテル、エチレンオキシド、テトラヒドロフラン等)、ケトン類(アセトン、メチルエチルケトン、シクロヘキサノン、メチルイソブチルケトン等)、エステル類(酢酸エチル、酢酸ブチル、エチレングリコールアセタート、酢酸アミル等)、酸アミド類(ジメチルホルムアミド、ジメチルアセトアニリド等)、ニトリル類(アセトニトリル、プロピオニトリル、アクリロニトリル等)、スルホキシド類(ジメチルスルホキシド等)、アルコールエーテル類(エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル等)等が挙げられる。
【0029】
補助剤としては、例えば非イオン型界面活性剤(ポリオキシエチレンアルキルエーテル、ポリオキシエチレンアルキルエステル、ポリオキシエチレンアルキルフェニルエーテル、ポリオキシエチレンソルビタンアルキルエステル、ソルビタンアルキルエステル等)、陰イオン型界面活性剤(アルキルベンゼンスルホナート、アルキルスルホサクシナート、ポリオキシエチレンアルキルスルファート、アリールスルホナート等)、陽イオン型界面活性剤(アルキルアミン類、ポリオキシエチレンアルキルアミン類、第四級アンモニウム塩類等)、両性型界面活性剤(アルキルアミノエチルグリシン、アルキルジメチルベタイン等)、ポリビニルアルコール、ヒドロキシプロピルセルロース、カルボキシメチルセルロース、アラビアゴム、トラガントガム、キサンタンガム、ポリビニルアセタート、ゼラチン、カゼイン、アルギン酸ソーダ等が挙げられる。
【0030】
さらに、本薬剤は、各種の農園芸用殺菌剤、除草剤、植物生長調節剤、殺虫剤、殺ダニ剤等の農薬や、肥料等と混合して用いることができる。
本薬剤における有効成分含有量は、製剤形態、施用方法、その他の条件によって種々異なる。通常は0.5〜95%(重量)、好ましくは2〜70%(重量)である。
【0031】
本薬剤の施用方法としては、植物への施用(茎葉散布)、植物の生育土壌への施用(土壌施用)、田面水への施用(水面施用)、種子への施用(種子処理)等が可能である。
【0032】
本薬剤の施用量に関しては、適用植物、適用病害等によっても異なるが、茎葉散布の場合には有効成分濃度1〜10000ppm、好ましくは10〜1000ppmの溶液を10アール当たり50〜300L施用するのが好ましく、土壌施用及び水面施用の場合には、有効成分量で10アール当たり0.1〜1000g、特に好ましくは10〜100g施用するのが好ましい。また、種子処理の場合には、種子1kgに対して、0.001〜50gの有効成分を施用するのが好ましい。
【0033】
【実施例】
次に本発明を合成例、製剤例及び試験例によって説明するが、本発明はこれらの実施例のみによって限定されるものではない。
【0034】
(合成例1)
ベンジルアミン1.08g、テトラヒドロフラン(THF)10ml及びトリエチルアミン4.2mlとを攪拌、氷冷し、これに2,6−ジクロロイソニコチン酸クロリド2.26gを3mlのジクロロメタンに溶解させた溶液を滴下した。反応液を室温で2時間攪拌した後、溶媒を減圧溜去し、これに希塩酸を加えた。析出物を濾取し、水洗、乾燥して2,6−ジクロロイソニコチン酸ベンジルアミド2.61gを得た(収率93%)。メタノール中より再結晶精製したものの融点は、151.5℃であった。核磁気共鳴スペクトル(内部標準TMS,溶媒DMSO−d6
δppm
4.5(d) 2H
7.1〜7.5(m) 5H
7.9(s) 2H
【0035】
(合成例2〜42)
ベンジルアミンの代わりに各種試薬を用いる他は合成例1と同様にして表2に記載の化合物、No.2〜42を得た。
【0036】
【表6】
Figure 0003833281
【0037】
【表7】
Figure 0003833281
【0038】
【表8】
Figure 0003833281
【0039】
【表9】
Figure 0003833281
【0040】
【表10】
Figure 0003833281
【0041】
【表11】
Figure 0003833281
【0042】
【表12】
Figure 0003833281
【0043】
(製剤例1)粉剤
化合物No.1〜42で示される2,6−ジクロロイソニコチン酸ベンジルアミド誘導体2重量部をそれぞれ、クレー98重量部と混合粉砕し、粉剤とした。
【0044】
(製剤例2)水和剤
化合物No.1〜42で示される2,6−ジクロロイソニコチン酸ベンジルアミド誘導体20重量部をそれぞれ、クレー68重量部、ホワイトカーボン8重量部及びポリオキシエチレンノニルフェニルエーテル4重量部と混合粉砕し、水和剤とした。
【0045】
(製剤例3)粒剤
化合物No.1〜42で示される2,6−ジクロロイソニコチン酸ベンジルアミド誘導体5重量部をそれぞれ、ベントナイト及びタルクの等量混合物90重量部及びアルキルベンゼンスルホン酸ナトリウム5重量部と混合粉砕し、粒剤に成型した。
【0046】
(試験例1)イネいもち病防除試験(土壌施用)
ポット(直径6cm,高さ5.5cm)で育種した2葉期のイネ(品種:愛知旭)に、(製剤例2)記載の水和剤各々から調製した薬液を土壌施用した(有効成分量で5mg/ポット)。14日後にイネいもち病菌(Pyricularia oryzae)の胞子懸濁液を噴霧接種し、25℃の湿室に24時間置いた後、温室内で発病させ、胞子懸濁液接種10日後に病斑数を調査し、下記式より防除価を算出した。対照薬剤として、2,6−ジクロロイソニコチン酸(特開昭63−93766号に記載)についても同様の方法で試験を行った。結果を表3に示す。尚、薬害が−とは薬害がないことを表わし、+とは薬害があったことを表す。
【0047】
【数1】
Figure 0003833281
【0048】
【表13】
Figure 0003833281
【0049】
【表14】
Figure 0003833281
【0050】
(試験例2)キュウリ斑点細菌病防除試験
ポット(直径10cm,高さ9cm)で育種した4葉期のキュウリ(品種:ときわ新地這)に、(製剤例2)記載の各々の水和剤から調製した有効成分濃度200ppmの薬液を茎葉散布した。7日後、病原細菌懸濁液を噴霧接種し、25℃の湿室に48時間置いた後、温室内で発病させ、病原細菌懸濁液接種7日後に下位4葉の病斑数を調査し、(試験例1)における場合と同様にして防除価を算出した。その結果、表2の化合物は85〜100%の防除価を示した。
【0051】
【発明の効果】
本発明に係る2,6−ジクロロイソニコチン酸ベンジルアミド誘導体を有効成分とする植物病害防除剤は、植物病原ウィルス、細菌及び糸状菌による各種の植物病害、特にイネの主要病害であるいもち病の防除に優れた効果を示すと共に薬害の心配もない。[0001]
[Industrial application fields]
The present invention relates to a 2,6-dichloroisonicotinic acid benzylamide derivative, which can be used as a plant disease control agent.
[0002]
[Prior art]
As an agricultural disinfectant relating to isonicotinic acid derivatives, for example, JP-A-63-93766 discloses that 2,6-dihalogenated isonicotinic acid and ester derivatives thereof are effective as plant disease control agents. Yes.
[0003]
[Problems to be solved by the invention]
However, the above compounds may cause phytotoxicity in plants to be protected, and a safer drug for plants has been demanded.
[0004]
[Means for Solving the Problems]
As a result of various studies to solve such problems, the present inventors have found that the 2,6-dichloroisonicotinic acid benzylamide derivative represented by the general formula (1) has no fear of phytotoxicity on plants, and has excellent plant disease control. It has been found that it shows activity, and the present invention has been completed.
[0005]
That is, the present invention provides the following general formula (1)
[0006]
[Chemical 2]
Figure 0003833281
[0007]
(Wherein R 1 represents a hydrogen atom, a lower alkyl group or an aralkyl group, R 2 and R 3 each independently represent a hydrogen atom, a lower alkyl group or a cyano group, and R 4 and R 5 each independently represent a hydrogen atom. An atom, a lower alkyl group, a lower alkoxy group, an amino group, a lower alkyl group-substituted amino group, a nitro group, a cyano group, a halogen atom, a halogen-substituted lower alkyl group or a halogen-substituted lower alkoxy group, and R 1 and R 4 , R 2 and R 3 , R 2 and R 4, or R 4 and R 5 can form a ring together), and a 2,6-dichloroisonicotinic acid benzylamide derivative represented by It relates to a plant disease control agent.
[0008]
In the general formula (1), R 1 represents a hydrogen atom, a lower alkyl group or an aralkyl group, and the lower alkyl group may be linear, branched or cyclic, such as a methyl group, an ethyl group, or n-propyl. Group, isopropyl group, n-butyl group, isobutyl group, 2-butyl group, tertiary butyl group, cyclopropyl group and the like having 1 to 4 carbon atoms, and aralkyl groups include benzyl group, phenylethyl group, Examples thereof include a pyridylmethyl group, a furylmethyl group, a thienylmethyl group, a 5-methyl-2-furylmethyl group, a 5-nitro-2-furylmethyl group, and a tetrahydrofurylmethyl group. R 1 is preferably a hydrogen atom, a lower alkyl group having 1 to 2 carbon atoms, a furylmethyl group, or the like.
[0009]
R 2 and R 3 each independently represents a hydrogen atom, a lower alkyl group or a cyano group, and the lower alkyl group may be linear, branched or cyclic, for example, a methyl group, an ethyl group, an n-propyl group, Examples thereof include those having 1 to 4 carbon atoms such as isopropyl group, n-butyl group, isobutyl group, 2-butyl group, tertiary butyl group and cyclopropyl group. R 2 may form a ring such as a cyclopentyl ring and a cyclohexyl ring together with R 3 . R 2 is preferably a hydrogen atom or a lower alkyl group, particularly preferably a lower alkyl group having 1 to 2 carbon atoms. R 3 is preferably a hydrogen atom or a lower alkyl group, particularly preferably a hydrogen atom.
[0010]
R 4 and R 5 are each independently a hydrogen atom, a lower alkyl group, a lower alkoxy group, an amino group, a lower alkyl group-substituted amino group, a nitro group, a cyano group, a halogen atom, a halogen-substituted lower alkyl group or a halogen-substituted lower alkoxy group. The lower alkyl group may be linear or branched. For example, a methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, 2-butyl group, tertiary butyl group Having 1 to 4 carbon atoms such as a lower alkoxy group having 1 to 3 carbon atoms such as a methoxy group, an ethoxy group, and an n-propoxy group, and a lower alkyl group-substituted amino group having an amino group which hydrogen atoms are substituted with the defined lower alkyl group having 1 to 4 carbon atoms in R 4, for example, dimethylamino group, di-substituted, such as diethylamino group Things, methylamino group, and mono-substituted compounds such as ethylamino group, respectively, also fluorine as the halogen atom, chlorine, bromine, iodine, halogen-substituted examples of the lower alkyl group, carbon atoms defined in R 4 1 And compounds having 1 to 5 halogen atoms substituted on the lower alkyl group of -4, such as a trifluoromethyl group, trichloromethyl group, difluoromethyl group, pentafluoroethyl group, and the like.
[0011]
R 4 is
(1) Rings such as tetrahydroisoquinoline together with R 1
(2) A ring such as indane or tetralin condensed with a benzene ring together with R 2
(3) Rings such as methylenedioxy group together with R 5
Can be formed.
[0012]
R 4 is preferably a hydrogen atom, a lower alkyl group (particularly an alkyl group having 1 to 2 carbon atoms), a lower alkoxy group (particularly an alkoxy group having 1 to 2 carbon atoms), or a lower alkyl group-substituted amino group (particularly a carbon number). Dialkyl compounds having 1 to 2 alkyl groups), nitro groups, halogen atoms (especially fluorine or chlorine), halogen-substituted lower alkyl groups (particularly alkyl groups having 1 to 3 carbon atoms substituted with 1 to 3 halogen atoms). R 5 is preferably a hydrogen atom or a lower alkoxy group, particularly preferably a hydrogen atom.
[0013]
Examples of the specific structure of the compound represented by the general formula (1) are shown in Table 1.
[0014]
[Table 1]
Figure 0003833281
[0015]
[Table 2]
Figure 0003833281
[0016]
[Table 3]
Figure 0003833281
[0017]
[Table 4]
Figure 0003833281
[0018]
[Table 5]
Figure 0003833281
[0019]
The compound represented by the general formula (1) in the present invention can be produced, for example, by the following method. However, the compound is not limited to these production methods.
[0020]
[Chemical 3]
Figure 0003833281
[0021]
That is, by reacting 2,6-dichloroisonicotinic acid chloride represented by the formula (2) with a benzylamine derivative represented by the general formula (3) in a suitable solvent in the presence of a base as necessary. A 2,6-dichloroisonicotinic acid benzylamide derivative represented by the general formula (1) can be produced.
[0022]
Examples of the reaction solvent include ethers such as tetrahydrofuran, halogenated hydrocarbons such as chloroform and dichloroethane, and aprotic polar solvents such as N, N-dimethylformamide and dimethyl sulfoxide. Bases include organic bases such as triethylamine, diisopropylethylamine, pyridine, 4-dimethylaminopyridine, diazabicycloundecene, hydroxides such as sodium hydroxide and potassium hydroxide, carbonates such as potassium carbonate and cesium carbonate, and the like. Can be used. While the reaction temperature varies depending on the solvent, base and the like, it is usually preferably −10 to 80 ° C., particularly preferably 0 to 50 ° C. While the reaction time varies depending on the reaction temperature, solvent, base and the like, it is generally 0.1 to 10 hours, preferably 0.5 to 5 hours.
[0023]
Moreover, among the compounds represented by the general formula (3), those in which R 1 is an aralkyl group can be produced, for example, by the following method. However, the compound is not limited to these production methods.
[0024]
[Formula 4]
Figure 0003833281
[0025]
(In the formula, R 6 represents an aryl group or an aralkyl group, and R 6 CH 2 represents R 1. )
That is, an aldehyde represented by the general formula (4) and a benzylamine derivative represented by the general formula (5) are subjected to a dehydration condensation reaction to obtain a Schiff base represented by the general formula (6), which is further reduced appropriately. The compound represented by the general formula (3) can be obtained by reduction using a reagent.
[0026]
The plant disease control agent comprising the 2,6-dichloroisonicotinic acid benzylamide derivative according to the present invention as an active ingredient is various plant disease control by phytopathogenic viruses, bacteria and filamentous fungi, for example, rice blast which is a major disease of rice Although it can be applied to spot disease of cucumber, etc., it has an excellent effect particularly on blast.
[0027]
This drug can be used alone as an active ingredient, but usually solid and liquid carriers used in agrochemical formulations, as well as dispersants, diluents, emulsifiers, spreading agents, thickeners, etc. It can be mixed with an auxiliary agent and formulated into dosage forms such as wettable powders, liquids, oils, powders, granules, sols (flowables) and the like.
[0028]
Examples of solid and liquid carriers include talc, clay, bentonite, kaolin, diatomaceous earth, montmorillonite, mica, vermiculite, gypsum, calcium carbonate, white carbon, wood flour, starch, alumina, silicate, sugar polymer, wax , Water, alcohols (methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, ethylene glycol, benzyl alcohol, etc.), petroleum fractions (petroleum ether, kerosene, solvent naphtha, etc.), aliphatic Or alicyclic hydrocarbons (n-hexane, cyclohexane, etc.), aromatic hydrocarbons (benzene, toluene, xylene, ethylbenzene, chlorobenzene, cumene, methylnaphthalene, etc.), halogenated hydrocarbons (chloroform, dichloromethane, etc.) , Ethers (isopropyl ether, ethylene oxide, tetrahydrofuran, etc.), ketones (acetone, methyl ethyl ketone, cyclohexanone, methyl isobutyl ketone, etc.), esters (ethyl acetate, butyl acetate, ethylene glycol acetate, amyl acetate, etc.), acid amides (Dimethylformamide, dimethylacetanilide, etc.), nitriles (acetonitrile, propionitrile, acrylonitrile, etc.), sulfoxides (dimethylsulfoxide, etc.), alcohol ethers (ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, etc.), etc. .
[0029]
Examples of auxiliary agents include nonionic surfactants (polyoxyethylene alkyl ether, polyoxyethylene alkyl ester, polyoxyethylene alkyl phenyl ether, polyoxyethylene sorbitan alkyl ester, sorbitan alkyl ester, etc.), anionic surfactant Agents (alkylbenzene sulfonate, alkylsulfosuccinate, polyoxyethylene alkylsulfate, arylsulfonate, etc.), cationic surfactants (alkylamines, polyoxyethylene alkylamines, quaternary ammonium salts, etc.), Amphoteric surfactants (alkylaminoethylglycine, alkyldimethylbetaine, etc.), polyvinyl alcohol, hydroxypropylcellulose, carboxymethylcellulose, gum arabic, traga Togamu, xanthan gum, polyvinyl acetate, gelatin, casein, sodium alginate, and the like.
[0030]
Further, the present drug can be used by mixing with various agricultural and horticultural fungicides, herbicides, plant growth regulators, pesticides such as insecticides and acaricides, fertilizers and the like.
The active ingredient content in this drug varies depending on the preparation form, application method, and other conditions. Usually, it is 0.5 to 95% (weight), preferably 2 to 70% (weight).
[0031]
Application methods of this drug include plant application (stem and foliage application), plant application to growing soil (soil application), paddy water application (water surface application), seed application (seed treatment), etc. It is.
[0032]
The application amount of this drug varies depending on the applied plant, the applied disease, etc., but in the case of foliage spraying, a solution having an active ingredient concentration of 1 to 10,000 ppm, preferably 10 to 1000 ppm, is applied at 50 to 300 L per 10 ares. Preferably, in the case of soil application and water surface application, it is preferable to apply 0.1 to 1000 g, particularly preferably 10 to 100 g per 10 ares as the amount of active ingredient. In the case of seed treatment, it is preferable to apply 0.001 to 50 g of an active ingredient per 1 kg of seed.
[0033]
【Example】
Next, the present invention will be described with reference to synthesis examples, formulation examples, and test examples, but the present invention is not limited only to these examples.
[0034]
(Synthesis Example 1)
1.08 g of benzylamine, 10 ml of tetrahydrofuran (THF) and 4.2 ml of triethylamine were stirred and ice-cooled, and a solution prepared by dissolving 2.26 g of 2,6-dichloroisonicotinic acid chloride in 3 ml of dichloromethane was added dropwise thereto. . After stirring the reaction solution at room temperature for 2 hours, the solvent was distilled off under reduced pressure, and diluted hydrochloric acid was added thereto. The precipitate was collected by filtration, washed with water and dried to obtain 2.61 g of 2,6-dichloroisonicotinic acid benzylamide (yield 93%). The melting point of what was recrystallized from methanol was 151.5 ° C. Nuclear magnetic resonance spectrum (internal standard TMS, solvent DMSO-d 6 )
δppm
4.5 (d) 2H
7.1-7.5 (m) 5H
7.9 (s) 2H
[0035]
(Synthesis Examples 2-42)
The compounds described in Table 2, No. 1, were prepared in the same manner as in Synthesis Example 1 except that various reagents were used instead of benzylamine. 2 to 42 were obtained.
[0036]
[Table 6]
Figure 0003833281
[0037]
[Table 7]
Figure 0003833281
[0038]
[Table 8]
Figure 0003833281
[0039]
[Table 9]
Figure 0003833281
[0040]
[Table 10]
Figure 0003833281
[0041]
[Table 11]
Figure 0003833281
[0042]
[Table 12]
Figure 0003833281
[0043]
(Formulation Example 1) Powder Compound No. 2 parts by weight of 2,6-dichloroisonicotinic acid benzylamide derivative represented by 1 to 42 was mixed and ground with 98 parts by weight of clay to prepare powder.
[0044]
(Formulation Example 2) Wettable Compound No. 20 parts by weight of 2,6-dichloroisonicotinic acid benzylamide derivative represented by 1-42 is mixed and ground with 68 parts by weight of clay, 8 parts by weight of white carbon and 4 parts by weight of polyoxyethylene nonylphenyl ether, respectively, and hydrated. An agent was used.
[0045]
(Formulation Example 3) Granule Compound No. 5 parts by weight of 2,6-dichloroisonicotinic acid benzylamide derivative represented by 1-42 is mixed and ground with 90 parts by weight of an equal mixture of bentonite and talc and 5 parts by weight of sodium alkylbenzene sulfonate, respectively, and formed into granules did.
[0046]
(Test Example 1) Rice blast control test (soil application)
The medicinal solution prepared from each of the wettable powders described in (Formulation Example 2) was applied to the two-leaf rice (variety: Aichi Asahi) bred in a pot (diameter 6 cm, height 5.5 cm) (Amount of active ingredient) At 5 mg / pot). 14 days later, a spore suspension of rice blast fungus (Pyricularia oryzae) was spray-inoculated, placed in a moist chamber at 25 ° C. for 24 hours, and then allowed to develop in a greenhouse. The control value was calculated from the following formula. As a control drug, 2,6-dichloroisonicotinic acid (described in JP-A-63-93766) was also tested in the same manner. The results are shown in Table 3. In addition,-represents that there was no phytotoxicity, and + represents that there was phytotoxicity.
[0047]
[Expression 1]
Figure 0003833281
[0048]
[Table 13]
Figure 0003833281
[0049]
[Table 14]
Figure 0003833281
[0050]
(Test Example 2) From each wettable powder described in (Formulation Example 2) to a four-leaf stage cucumber (variety: Tokiwa Shinchien) bred in a cucumber spotted bacterial disease control test pot (diameter 10 cm, height 9 cm) The prepared chemical solution having an active ingredient concentration of 200 ppm was sprayed on the foliage. Seven days later, the bacterial pathogen suspension was spray-inoculated, placed in a wet room at 25 ° C. for 48 hours, then diseased in the greenhouse, and the number of lesions on the lower 4 leaves was investigated 7 days after the pathogenic bacterial suspension inoculation. The control value was calculated in the same manner as in (Test Example 1). As a result, the compounds shown in Table 2 exhibited a control value of 85 to 100%.
[0051]
【The invention's effect】
The plant disease control agent comprising the 2,6-dichloroisonicotinic acid benzylamide derivative according to the present invention as an active ingredient is used for various plant diseases caused by phytopathogenic viruses, bacteria and filamentous fungi, particularly rice blast which is a major disease of rice. It has excellent control effects and is free from chemical damage.

Claims (6)

下記一般式(1)
Figure 0003833281
(式中、R1は水素原子、低級アルキル基又はアラルキル基を表し、R2及びR3はそれぞれ独立に水素原子、低級アルキル基又はシアノ基を表し、R4及びR5はそれぞれ独立に水素原子、低級アルキル基、低級アルコキシ基、アミノ基、低級アルキル基置換アミノ基、ニトロ基、シアノ基、ハロゲン原子、ハロゲン置換低級アルキル基又はハロゲン置換低級アルコキシ基を表す。また、R1とR4、R2とR3、R2とR4又はR4とR5は、共に環を形成することもできる。)で示される2,6−ジクロロイソニコチン酸ベンジルアミド誘導体。
The following general formula (1)
Figure 0003833281
(Wherein R 1 represents a hydrogen atom, a lower alkyl group or an aralkyl group, R 2 and R 3 each independently represent a hydrogen atom, a lower alkyl group or a cyano group, and R 4 and R 5 each independently represent a hydrogen atom. An atom, a lower alkyl group, a lower alkoxy group, an amino group, a lower alkyl group-substituted amino group, a nitro group, a cyano group, a halogen atom, a halogen-substituted lower alkyl group or a halogen-substituted lower alkoxy group, and R 1 and R 4 , R 2 and R 3 , R 2 and R 4, or R 4 and R 5 can form a ring together.), 2,6-dichloroisonicotinic acid benzylamide derivative.
一般式(1)において、R2が水素原子又は低級アルキル基である請求項1記載の2,6−ジクロロイソニコチン酸ベンジルアミド誘導体。The 2,6-dichloroisonicotinic acid benzylamide derivative according to claim 1, wherein R 2 in formula (1) is a hydrogen atom or a lower alkyl group. 一般式(1)において、R2が低級アルキル基である請求項2記載の2,6−ジクロロイソニコチン酸ベンジルアミド誘導体。The 2,6-dichloroisonicotinic acid benzylamide derivative according to claim 2 , wherein R 2 in the general formula (1) is a lower alkyl group. 3が水素原子又は低級アルキル基である請求項1〜3のいずれか1項に記載の2,6−ジクロロイソニコチン酸ベンジルアミド誘導体。The 2,6-dichloroisonicotinic acid benzylamide derivative according to any one of claims 1 to 3 , wherein R 3 is a hydrogen atom or a lower alkyl group. 4が水素原子、低級アルキル基、低級アルコキシ基、低級アルキル基置換アミノ基、ニトロ基、ハロゲン原子又はハロゲン置換低級アルキル基であり、R5が水素原子又は低級アルコキシ基である請求項1〜4のいずれか1項に記載の2,6−ジクロロイソニコチン酸ベンジルアミド誘導体。R 4 is a hydrogen atom, a lower alkyl group, a lower alkoxy group, a lower alkyl group-substituted amino group, a nitro group, a halogen atom or a halogen-substituted lower alkyl group, and R 5 is a hydrogen atom or a lower alkoxy group. 5. The 2,6-dichloroisonicotinic acid benzylamide derivative according to any one of 4 above. 請求項1〜5のいずれか1項に記載の2,6−ジクロロイソニコチン酸ベンジルアミド誘導体を有効成分として含有する植物病害防除剤。A plant disease control agent comprising the 2,6-dichloroisonicotinic acid benzylamide derivative according to any one of claims 1 to 5 as an active ingredient.
JP01691095A 1995-02-03 1995-02-03 2,6-dichloroisonicotinic acid benzylamide derivative and plant disease control agent Expired - Fee Related JP3833281B2 (en)

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