JP4239473B2 - Process for producing pyridone compounds and intermediates thereof - Google Patents

Process for producing pyridone compounds and intermediates thereof Download PDF

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JP4239473B2
JP4239473B2 JP2002127972A JP2002127972A JP4239473B2 JP 4239473 B2 JP4239473 B2 JP 4239473B2 JP 2002127972 A JP2002127972 A JP 2002127972A JP 2002127972 A JP2002127972 A JP 2002127972A JP 4239473 B2 JP4239473 B2 JP 4239473B2
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formula
compound represented
acid
reaction
halogen atom
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JP2003321468A (en
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芳伴 遠山
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Sumitomo Chemical Co Ltd
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Sumitomo Chemical Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明はピリドン化合物の製造法およびその中間体に関する。
【0002】
【従来の技術および発明が解決しようとする課題】
式(5)
【化6】

Figure 0004239473
(式中、R1はハロゲン原子、シアノ基またはニトロ基を表し、R2は水素原子またはハロゲン原子を表し、R4はC1−C6アルコキシ基を表す。)
で示されるウラシル化合物が除草剤として有用であることが知られており(EP1122244A1公報参照)、その工業的に有利な製造法の開発が望まれている。
本発明は、式(5)で示されるウラシル化合物に短工程で誘導できる式(2)で示されるピリドン化合物およびその中間体を提供することを課題とする。
【0003】
【課題を解決するための手段】
本発明者は、式(5)で示されるウラシル化合物を工業的に有利に製造する方法を見出すべく鋭意検討した結果、後記式(1)で示されるジエン化合物と酸とを反応させることにより式(5)で示されるウラシル化合物に短工程で誘導できる式(2)で示されるピリドン化合物が得られること;さらに後記式(3)で示される2−フェノキシアセトアミド化合物と後記式(4)で示される1,5−ジアザペンタジエニウム塩とを反応させ、次いで酸と反応させることにより式(2)で示されるピリドン化合物が得られること、を見出し本発明を完成した。
【0004】
即ち、本発明は、
1.式(1)
【化7】
Figure 0004239473
(式中、R1はハロゲン原子、シアノ基またはニトロ基を表し、R2は水素原子またはハロゲン原子を表し、R3はC1−C3アルキル基を表す。)
で示されるジエン化合物と酸とを反応させることを特徴とする式(2)
【化8】
Figure 0004239473
(式中、R1およびR2は前記と同じ意味を表す。)
で示されるピリドン化合物の製造法(以下、本発明製造法1と記す。)、および
【0005】
2.式(3)
Figure 0004239473
(式中、R1はハロゲン原子、シアノ基またはニトロ基を表し、R2は水素原子またはハロゲン原子を表す。)
で示されるアミド化合物と式(4)
3 2NCH=CH−CH=N+3 2- (4)
(式中、R3はC1−C3アルキル基を表し、Aはハロゲン原子を表す。)
で示される1,5−ジアザペンタジエニウム塩とを反応させ、次いで酸と反応させることを特徴とする式(2)
Figure 0004239473
(式中、R1およびR2は前記と同じ意味を表す。)
で示されるピリドン化合物の製造法(以下、本発明製造法2と記す。また、本発明製造法1と本発明製造法2とを合わせて本発明製造法と総称する。)を提供する。
【0006】
本発明はさらに式(1)
【化9】
Figure 0004239473
(式中、R1およびR2は請求項1と同じ意味を表す。)
で示されるジエン化合物をも提供する。
【0007】
【発明の実施の形態】
本発明においてR1およびR2で示されるハロゲン原子としては例えばフッ素原子、塩素原子および臭素原子があげられ、R3で示されるC1−C3アルキル基としては例えばメチル基があげられる。
【0008】
まず、本発明製造法1について説明する。
本発明製造法1は式(1)で示されるジエン化合物と酸とを反応させることを特徴とする。
該反応は溶媒の存在下、または非存在下で行われる。反応に用いられる溶媒としては、例えばヘキサン、ヘプタン、オクタン等の脂肪族炭化水素類、トルエン、キシレン等の芳香族炭化水素類、ジクロロメタン、1,2−ジクロロエタン、クロロベンゼン等のハロゲン化炭化水素類、ジエチルエーテル、メチル−tert−ブチルエーテル、1,4−ジオキサン、エチレングリコールジメチルエーテル等のエーテル類およびこれらの混合物があげられる。
該反応に用いられる酸としては、例えば酢酸、プロピオン酸、シュウ酸等の脂肪族カルボン酸、安息香酸、サリチル酸等の芳香族カルボン酸、パラトルエンスルホン酸、メタンスルホン酸、トリフルオロメタンスルホン酸等のスルホン酸、および塩化水素、硫酸、リン酸等の無機酸およびこれらの混合物があげられる。
反応に用いられる酸の量は、式(1)で示されるジエン化合物1モルに対して触媒量〜過剰量の割合であり、具体的には例えば0.01〜100モルの割合である。
該反応の反応温度は通常20〜150℃の範囲であり、反応時間は通常瞬時〜48時間の範囲である。
該反応は例えば式(1)で示される化合物と酸とを必要に応じて溶媒中で混合することにより行うことができる。
反応終了後は反応混合物を水に注加して、有機溶媒抽出し、得られた有機層を乾燥、濃縮する等の後処理操作を行うことにより式(2)で示されるピリドン化合物を単離することができる。単離した式(2)で示される化合物はクロマトグラフィー等によりさらに精製することもできる。
【0009】
次に、本発明製造法2について説明する。
本発明製造法2は式(3)で示されるアミド化合物と式(4)で示される1,5−ジアザペンタジエニウム塩とを反応させ、次いで酸とを反応させることを特徴とする。
即ち、本発明製造法2は式(3)で示されるアミド化合物と式(4)で示される1,5−ジアザペンタジエニウム塩とを反応させる前半工程と、前半工程の生成物と酸とを反応させることを特徴とする後半工程とからなる。
【0010】
まず、前半工程から説明する。
前半工程の反応は、通常溶媒中、塩基と共に反応させることにより行われる。
該反応に用いられる溶媒としては、例えばヘキサン、ペンタン、オクタン等の脂肪族炭化水素類、ジエチルエーテル、メチル−tert−ブチルエーテル、テトラヒドロフラン、1,4−ジオキサン、エチレングリコールジメチルエーテル等のエーテル類およびN,N−ジメチルホルムアミド等の酸アミド類があげられる。
該反応に用いられる塩基としては、例えば水素化ナトリウム、水素化カリウム等のアルカリ金属水素化物、トリエチルアミン、ジイソプロピルエチルアミン、1,8−ジアザビシクロ[5.4.0]ウンデック−7−エン等の第三級アミンおよびリチウムヘキサメチルジシラジド、ナトリウムヘキサメチルジシラジド、カリウムヘキサメチルジシラジド等の金属アミドがあげられる。
反応に供される試剤の量は、式(3)で示されるアミド化合物1モルに対して式(4)で示される1,5−ジアザペンタジエニウム塩が通常1〜3モルの割合、塩基が通常1〜3モルの割合であるが、反応の状況に応じて適宜変化させることもできる。
該反応の反応温度は通常−30〜60℃の範囲であり、反応時間は通常瞬時〜24時間の範囲である。
該反応は例えば、溶媒中で式(3)で示されるアミド化合物、式(4)で示される1,5−ジアザペンタジエニウム塩および塩基を混合することにより行うことができる。
反応終了後は、反応混合物を水または酸性水(例えば希塩酸)に注加し、これを有機溶媒抽出し、得られた有機層を乾燥、濃縮する等の後処理操作を行うことにより、式(1)で示されるジエン化合物を単離することができる。単離した式(1)で示されるジエン化合物はクロマトグラフィー等によりさらに精製することもできる。
【0011】
このようにして製造できる式(1)で示されるジエン化合物としては、例えばR1およびR2がハロゲン原子である化合物が挙げられ、式(1)で示されるジエン化合物の具体例を(表1)に示す。
【0012】
式(1)
【化10】
Figure 0004239473
で示される化合物。
【0013】
【表1】
Figure 0004239473
【0014】
本発明製造法2の後半工程は本発明製造法1と同様に行うことができる。
【0015】
本発明製造法により得られる式(2)で示されるピリドン化合物は、例えばロジウム(II)触媒存在下で、式(6)
2CHCOR5 (6)
(式中、R5はメトキシ基またはエトキシ基を表す。)
で示されるジアゾ酢酸エステル化合物と反応させることにより式(7)
【化11】
Figure 0004239473
(式中、R1、R2およびR5は前記と同じ意味を表す。)
で示されるウラシル化合物に誘導することができる。
該反応は通常溶媒中で行われ、反応温度は通常60〜120℃の範囲であり、反応時間は通常瞬時〜72時間の範囲である。反応に用いられる溶媒としては例えば1,2−ジクロロエタン等のハロゲン化炭化水素類があげられる。
反応に供される試剤の量は式(2)で示されるピリドン化合物1モルに対して式(6)で示されるジアゾ酢酸エステル化合物が通常0.5〜2モルの割合であり、ロジウム(II)触媒が通常1〜5モル%の割合であるが、反応の状況に応じて適宜変換させることができる。
該反応に用いられるロジウム(II)触媒とは、ロジウム(Rh)の2価の陽イオンと適当な陰イオン(場合によりさらに適当な配位子)からなる金属触媒であり、具体的には例えばロジウム(II)トリフルオロアセテートダイマーがあげられる。
反応終了後は、反応混合物を濾過し、濾液を濃縮する;反応混合物を有機溶媒で希釈して、炭酸水素ナトリウム水溶液と分液し、得られた有機層を乾燥した後、濃縮する、等の後処理を行うことにより、式(7)で示されるウラシル化合物を単離することができる。単離した式(7)で示されるウラシル化合物はクロマトグラフィー等により更に精製することもできる。
【0016】
式(7)で示されるウラシル化合物は式(8)
6H (8)
(式中、R6はC3−C6アルコキシ基を表す。)
で示される化合物とのエステル交換反応を行うことにより式(9)
【化12】
Figure 0004239473
(式中、R1、R2およびR6は前記と同じ意味を表す。)
で示されるウラシル化合物に誘導することができる。
【0017】
以上説明したように、本発明製造法で製造できる式(2)で示されるピリドン化合物は1〜2工程の変換を行うことにより、除草剤として有用な式(5)で示されるウラシル化合物に誘導することができる。
即ち、式(5)で示されるウラシル化合物は、本発明製造法を用いることにより、EP1122244A1公報に記載された方法と比べ、工業的に入手困難な2−クロロ−3−ニトロピリジンを使用することなく、また全体として短工程で製造できる。
【0018】
本発明製造法に用いる式(3)で示されるアミド化合物は例えば特開昭63−41466号公報に記載の公知化合物であるか、該公報に記載の方法に準じて製造することができる。
また、本発明製造法に用いる式(4)で示される1,5−ジアザペンタジエニウム塩は例えばJ.Org.Chem.1981,46,4759−4765に記載された方法で製造することができる。
【0019】
【実施例】
以下、本発明を製造例等によりさらに詳しく説明するが、本発明はこれらの例に限定されるものではない。
【0020】
製造例1
2−クロロ−4−フルオロ−5−(3−メチル−2,6−ジオキソ−4−(トリフルオロメチル)−1,2,3,6−テトラヒドロピリミジン−1−イル)フェノキシアセトアミド(下式(A)で示される化合物)
【化13】
Figure 0004239473
0.2gをテトラヒドロフラン5mlに溶解し、ここに0℃で水素化ナトリウム(60%油性)0.04gを加え、室温で20分間攪拌した。次いで、反応混合物を約0℃に冷却し、ここに塩化1,1,5,5−テトラメチル−1,5−ジアザペンタジエニウム0.18gを加え、同温で30分間、次いで室温で3時間攪拌した。その後、反応混合物に氷水を加え、酢酸エチルで抽出した。有機層を飽和食塩水で洗浄し、無水硫酸マグネシウムで乾燥した後、濃縮した。残渣をシリカゲルカラムクロマトグラフィーに付して、下式(B)で示される化合物
【化14】
Figure 0004239473
0.055gを得た。
1H−NMR(CDCl/400MHz)δ(ppm):2.83(s,6H),3.52(s,3H),4.78(dd,1H,J=12.8,12Hz),5.24(bs,1H),5.88(bs,1H),6.31(s,1H),6.64(d,1H,J=12.8Hz),6.81(d,1H,J=6.4Hz),7.18(d,1H,J=12Hz),7.34(d,1H,J=8.8Hz)
【0021】
製造例2
式(B)で示される化合物0.05gと酢酸0.2mlとの混合物を40〜60℃で2時間攪拌した。その後、反応混合物に水を加え、酢酸エチルで抽出した。有機層を飽和食塩水で洗浄し、無水硫酸マグネシウムで乾燥した後、濃縮した。残渣をシリカゲルカラムクロマトグラフィーに付し、3−[2−クロロ−4−フルオロ−5−(3−メチル−2,6−ジオキソ−4−(トリフルオロメチル)−1,2,3,6−テトラヒドロピリミジン−1−イル)フェノキシ]−1H−ピリジン−2−オン(下式(C)で示される化合物)
【化15】
Figure 0004239473
0.022gを得た。
1H−NMR(CDCl3/300MHz)δ(ppm):3.52(s,3H),6.22(dd,1H,J=7.0,7.0Hz),6.32(s,1H),6.95(d,1H,J=6.6Hz),7.00(dd,1H,J=7.0,1.6Hz),7.2−7.3(m,1H),7.39(d,1H,J=8.9Hz)
【0022】
参考製造例1
3−[2−クロロ−4−フルオロ−5−(3−メチル−2,6−ジオキソ−4−(トリフルオロメチル)−1,2,3,6−テトラヒドロピリミジン−1−イル)フェノキシ]−1H−ピリジン−2−オン0.5gとロジウム(II)トリフルオロアセテートダイマー8mgとを1,2−ジクロロエタン15mlに加え、80℃にてジアゾ酢酸メチル0.15gを3時間かけて滴下した。滴下終了後、80℃にて1時間攪拌した後に、該反応混合物を濃縮した。残渣をシリカゲルカラムクロマトグラフィーに付し(展開溶媒;ヘキサン/酢酸エチル=3/1〜0/1)た。未反応原料として、3−[2−クロロ−4−フルオロ−5−(3−メチル−2,6−ジオキソ−4−(トリフルオロメチル)−1,2,3,6−テトラヒドロピリミジン−1−イル)フェノキシ]−1H−ピリジン−2−オン0.18gを回収し、3−[2−クロロ−4−フルオロ−5−(3−メチル−2,6−ジオキソ−4−(トリフルオロメチル)−1,2,3,6−テトラヒドロピリミジン−1−イル)フェノキシ]−2−(メトキシカルボニルメトキシ)ピリジン(下式(D)で示される化合物)
【化16】
Figure 0004239473
0.34gを得た。
融点:52.2℃
1H−NMR(300MHz,CDCl3,TMSδ(ppm)):3.50(3H,q,J=1.0Hz)、3.70(3H,s)、4.90(1H,d,J=15.8Hz)、4.97(1H,d,J=15.8Hz)、6.29(1H,s)、6.90〜6.95(2H,m)、7.32(1H,dd,J=1.9Hz,7.7Hz)、7.37(1H,d,J=8.7Hz)、7.92(1H,dd,J=1.9Hz,4.9Hz)
【0023】
【発明の効果】
本発明製造法により優れた除草活性を有する式(5)で示されるウラシル化合物に短工程で誘導することができる式(2)で示されるピリドン化合物を容易に製造することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a pyridone compound and an intermediate thereof.
[0002]
[Background Art and Problems to be Solved by the Invention]
Formula (5)
[Chemical 6]
Figure 0004239473
(Wherein R 1 represents a halogen atom, a cyano group or a nitro group, R 2 represents a hydrogen atom or a halogen atom, and R 4 represents a C1-C6 alkoxy group.)
Is known to be useful as a herbicide (see EP 1122244A1), and development of an industrially advantageous production method is desired.
This invention makes it a subject to provide the pyridone compound shown by Formula (2) which can be induced | guided | derived to a uracil compound shown by Formula (5) by a short process, and its intermediate body.
[0003]
[Means for Solving the Problems]
As a result of intensive studies to find a method for industrially advantageously producing the uracil compound represented by the formula (5), the present inventor has reacted the diene compound represented by the following formula (1) with an acid. A pyridone compound represented by the formula (2) that can be derived in a short process to the uracil compound represented by the formula (5) is obtained; a 2-phenoxyacetamide compound represented by the following formula (3) and a formula (4) The present invention was completed by finding that a pyridone compound represented by the formula (2) can be obtained by reacting with a 1,5-diazapentadienium salt and then reacting with an acid.
[0004]
That is, the present invention
1. Formula (1)
[Chemical 7]
Figure 0004239473
(In the formula, R 1 represents a halogen atom, a cyano group or a nitro group, R 2 represents a hydrogen atom or a halogen atom, and R 3 represents a C1-C3 alkyl group.)
Wherein the diene compound represented by formula (2) is reacted with an acid.
[Chemical 8]
Figure 0004239473
(In the formula, R 1 and R 2 represent the same meaning as described above.)
A process for producing a pyridone compound represented by the formula (hereinafter referred to as the production process 1 of the present invention), and
2. Formula (3)
Figure 0004239473
(In the formula, R 1 represents a halogen atom, a cyano group or a nitro group, and R 2 represents a hydrogen atom or a halogen atom.)
An amide compound represented by formula (4)
R 3 2 NCH = CH-CH = N + R 3 2 A - (4)
(In the formula, R 3 represents a C1-C3 alkyl group, and A represents a halogen atom.)
Wherein the compound is reacted with a 1,5-diazapentadienium salt represented by the formula (2)
Figure 0004239473
(In the formula, R 1 and R 2 represent the same meaning as described above.)
(Hereinafter referred to as the production method 2 of the present invention. The production method 1 of the present invention and the production method 2 of the present invention are collectively referred to as the production method of the present invention).
[0006]
The present invention further provides formula (1)
[Chemical 9]
Figure 0004239473
(Wherein R 1 and R 2 represent the same meaning as in claim 1).
Also provided is a diene compound represented by:
[0007]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, examples of the halogen atom represented by R 1 and R 2 include a fluorine atom, a chlorine atom and a bromine atom, and examples of the C1-C3 alkyl group represented by R 3 include a methyl group.
[0008]
First, the manufacturing method 1 of this invention is demonstrated.
The production method 1 of the present invention is characterized in that the diene compound represented by the formula (1) is reacted with an acid.
The reaction is performed in the presence or absence of a solvent. Examples of the solvent used for the reaction include aliphatic hydrocarbons such as hexane, heptane and octane, aromatic hydrocarbons such as toluene and xylene, halogenated hydrocarbons such as dichloromethane, 1,2-dichloroethane and chlorobenzene, And ethers such as diethyl ether, methyl-tert-butyl ether, 1,4-dioxane, ethylene glycol dimethyl ether, and mixtures thereof.
Examples of the acid used in the reaction include aliphatic carboxylic acids such as acetic acid, propionic acid, and oxalic acid, aromatic carboxylic acids such as benzoic acid and salicylic acid, p-toluenesulfonic acid, methanesulfonic acid, and trifluoromethanesulfonic acid. Examples thereof include sulfonic acids, inorganic acids such as hydrogen chloride, sulfuric acid and phosphoric acid, and mixtures thereof.
The amount of the acid used in the reaction is a ratio of a catalyst amount to an excess amount, and specifically, for example, a ratio of 0.01 to 100 mol with respect to 1 mol of the diene compound represented by the formula (1).
The reaction temperature of the reaction is usually in the range of 20 to 150 ° C., and the reaction time is usually in the range of instantaneous to 48 hours.
The reaction can be performed, for example, by mixing the compound represented by the formula (1) and an acid in a solvent as necessary.
After completion of the reaction, the pyridone compound represented by the formula (2) is isolated by performing post-treatment operations such as pouring the reaction mixture into water, extracting with an organic solvent, and drying and concentrating the obtained organic layer. can do. The isolated compound represented by the formula (2) can be further purified by chromatography or the like.
[0009]
Next, production method 2 of the present invention will be described.
The production method 2 of the present invention is characterized in that an amide compound represented by the formula (3) and a 1,5-diazapentadienium salt represented by the formula (4) are reacted and then an acid is reacted.
That is, the production method 2 of the present invention comprises the first half step of reacting the amide compound represented by the formula (3) with the 1,5-diazapentadienium salt represented by the formula (4), and the product and acid of the first half step. And the latter half process characterized by reacting.
[0010]
First, the first half process will be described.
The reaction in the first half step is usually carried out by reacting with a base in a solvent.
Examples of the solvent used in the reaction include aliphatic hydrocarbons such as hexane, pentane, and octane, ethers such as diethyl ether, methyl-tert-butyl ether, tetrahydrofuran, 1,4-dioxane, ethylene glycol dimethyl ether, and N, And acid amides such as N-dimethylformamide.
Examples of the base used for the reaction include alkali metal hydrides such as sodium hydride and potassium hydride, triethylamine, diisopropylethylamine, 1,8-diazabicyclo [5.4.0] undec-7-ene and the like. Examples include primary amines and metal amides such as lithium hexamethyldisilazide, sodium hexamethyldisilazide, and potassium hexamethyldisilazide.
The amount of the reagent used for the reaction is usually 1 to 3 mol of the 1,5-diazapentadienium salt represented by the formula (4) with respect to 1 mol of the amide compound represented by the formula (3). The base is usually in a ratio of 1 to 3 moles, but can be appropriately changed depending on the reaction conditions.
The reaction temperature of the reaction is usually in the range of −30 to 60 ° C., and the reaction time is usually in the range of instantaneous to 24 hours.
The reaction can be performed, for example, by mixing an amide compound represented by the formula (3), a 1,5-diazapentadienium salt represented by the formula (4) and a base in a solvent.
After completion of the reaction, the reaction mixture is poured into water or acidic water (eg dilute hydrochloric acid), extracted with an organic solvent, and the resulting organic layer is dried and concentrated to perform post-treatment operations such as The diene compound represented by 1) can be isolated. The isolated diene compound represented by the formula (1) can be further purified by chromatography or the like.
[0011]
Examples of the diene compound represented by the formula (1) that can be produced in this manner include compounds in which R 1 and R 2 are halogen atoms. Specific examples of the diene compound represented by the formula (1) (Table 1) ).
[0012]
Formula (1)
[Chemical Formula 10]
Figure 0004239473
A compound represented by
[0013]
[Table 1]
Figure 0004239473
[0014]
The latter half of the production method 2 of the present invention can be carried out in the same manner as the production method 1 of the present invention.
[0015]
The pyridone compound represented by the formula (2) obtained by the production method of the present invention is obtained by, for example, formula (6)
N 2 CHCOR 5 (6)
(In the formula, R 5 represents a methoxy group or an ethoxy group.)
By reacting with a diazoacetate compound represented by formula (7)
Embedded image
Figure 0004239473
(In the formula, R 1 , R 2 and R 5 have the same meaning as described above.)
It can be derived into a uracil compound represented by
The reaction is usually carried out in a solvent, the reaction temperature is usually in the range of 60 to 120 ° C., and the reaction time is usually in the range of instantaneous to 72 hours. Examples of the solvent used in the reaction include halogenated hydrocarbons such as 1,2-dichloroethane.
The amount of the reagent used for the reaction is usually 0.5 to 2 mol of the diazoacetate compound represented by the formula (6) with respect to 1 mol of the pyridone compound represented by the formula (2). ) The catalyst is usually in a proportion of 1 to 5 mol%, but can be appropriately converted depending on the reaction conditions.
The rhodium (II) catalyst used in the reaction is a metal catalyst composed of a rhodium (Rh) divalent cation and an appropriate anion (in some cases, an appropriate ligand). And rhodium (II) trifluoroacetate dimer.
After completion of the reaction, the reaction mixture is filtered and the filtrate is concentrated; the reaction mixture is diluted with an organic solvent, separated from an aqueous sodium hydrogen carbonate solution, and the resulting organic layer is dried and concentrated. By performing the post-treatment, the uracil compound represented by the formula (7) can be isolated. The isolated uracil compound represented by the formula (7) can be further purified by chromatography or the like.
[0016]
The uracil compound represented by the formula (7) has the formula (8)
R 6 H (8)
(In the formula, R 6 represents a C3-C6 alkoxy group.)
By transesterification with the compound represented by formula (9)
Embedded image
Figure 0004239473
(Wherein R 1 , R 2 and R 6 have the same meaning as described above.)
It can be derived into a uracil compound represented by
[0017]
As described above, the pyridone compound represented by the formula (2) that can be produced by the production method of the present invention is derived into a uracil compound represented by the formula (5) that is useful as a herbicide by performing conversion in 1 to 2 steps. can do.
That is, the uracil compound represented by the formula (5) uses 2-chloro-3-nitropyridine, which is difficult to obtain industrially compared to the method described in EP1122244A1 by using the production method of the present invention. It can be manufactured in a short process as a whole.
[0018]
The amide compound represented by the formula (3) used in the production method of the present invention is, for example, a known compound described in JP-A-63-41466, or can be produced according to the method described in the publication.
The 1,5-diazapentadienium salt represented by the formula (4) used in the production method of the present invention is, for example, J. Org. Chem. 1981, 46, 4759-4765.
[0019]
【Example】
Hereinafter, the present invention will be described in more detail with reference to production examples and the like, but the present invention is not limited to these examples.
[0020]
Production Example 1
2-chloro-4-fluoro-5- (3-methyl-2,6-dioxo-4- (trifluoromethyl) -1,2,3,6-tetrahydropyrimidin-1-yl) phenoxyacetamide (formula ( Compound represented by A)
Embedded image
Figure 0004239473
0.2 g was dissolved in 5 ml of tetrahydrofuran, 0.04 g of sodium hydride (60% oily) was added thereto at 0 ° C., and the mixture was stirred at room temperature for 20 minutes. Next, the reaction mixture is cooled to about 0 ° C., and 0.18 g of 1,1,5,5-tetramethyl-1,5-diazapentadienium chloride is added thereto, and the same temperature is maintained for 30 minutes and then at room temperature. Stir for 3 hours. Thereafter, ice water was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate, and concentrated. The residue was subjected to silica gel column chromatography to obtain a compound represented by the following formula (B):
Figure 0004239473
0.055 g was obtained.
1 H-NMR (CDCl 3 /400MHz)δ(ppm):2.83(s,6H),3.52(s,3H),4.78(dd,1H,J=12.8,12Hz ), 5.24 (bs, 1H), 5.88 (bs, 1H), 6.31 (s, 1H), 6.64 (d, 1H, J = 12.8 Hz), 6.81 (d, 1H, J = 6.4 Hz), 7.18 (d, 1H, J = 12 Hz), 7.34 (d, 1H, J = 8.8 Hz)
[0021]
Production Example 2
A mixture of 0.05 g of the compound represented by the formula (B) and 0.2 ml of acetic acid was stirred at 40 to 60 ° C. for 2 hours. Thereafter, water was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate, and concentrated. The residue was subjected to silica gel column chromatography, and 3- [2-chloro-4-fluoro-5- (3-methyl-2,6-dioxo-4- (trifluoromethyl) -1,2,3,6- Tetrahydropyrimidin-1-yl) phenoxy] -1H-pyridin-2-one (compound represented by the following formula (C))
Embedded image
Figure 0004239473
0.022 g was obtained.
1 H-NMR (CDCl 3 /300MHz)δ(ppm):3.52(s,3H),6.22(dd,1H,J=7.0,7.0Hz),6.32(s,1H ), 6.95 (d, 1H, J = 6.6 Hz), 7.00 (dd, 1H, J = 7.0, 1.6 Hz), 7.2-7.3 (m, 1H), 7 .39 (d, 1H, J = 8.9 Hz)
[0022]
Reference production example 1
3- [2-Chloro-4-fluoro-5- (3-methyl-2,6-dioxo-4- (trifluoromethyl) -1,2,3,6-tetrahydropyrimidin-1-yl) phenoxy]- 0.5 g of 1H-pyridin-2-one and 8 mg of rhodium (II) trifluoroacetate dimer were added to 15 ml of 1,2-dichloroethane, and 0.15 g of methyl diazoacetate was added dropwise at 80 ° C. over 3 hours. After completion of the dropwise addition, the reaction mixture was concentrated after stirring at 80 ° C. for 1 hour. The residue was subjected to silica gel column chromatography (developing solvent; hexane / ethyl acetate = 3/1 to 0/1). As an unreacted raw material, 3- [2-chloro-4-fluoro-5- (3-methyl-2,6-dioxo-4- (trifluoromethyl) -1,2,3,6-tetrahydropyrimidine-1- Yl) phenoxy] -1H-pyridin-2-one 0.18 g was recovered and 3- [2-chloro-4-fluoro-5- (3-methyl-2,6-dioxo-4- (trifluoromethyl) -1,2,3,6-tetrahydropyrimidin-1-yl) phenoxy] -2- (methoxycarbonylmethoxy) pyridine (compound represented by the following formula (D))
Embedded image
Figure 0004239473
0.34 g was obtained.
Melting point: 52.2 ° C
1 H-NMR (300 MHz, CDCl 3 , TMSδ (ppm)): 3.50 (3H, q, J = 1.0 Hz), 3.70 (3H, s), 4.90 (1H, d, J = 15.8 Hz), 4.97 (1 H, d, J = 15.8 Hz), 6.29 (1 H, s), 6.90 to 6.95 (2 H, m), 7.32 (1 H, dd, J = 1.9 Hz, 7.7 Hz), 7.37 (1H, d, J = 8.7 Hz), 7.92 (1H, dd, J = 1.9 Hz, 4.9 Hz)
[0023]
【The invention's effect】
The pyridone compound represented by the formula (2) that can be induced in a short process to the uracil compound represented by the formula (5) having excellent herbicidal activity by the production method of the present invention can be easily produced.

Claims (5)

式(1)
Figure 0004239473
(式中、R1はハロゲン原子、シアノ基またはニトロ基を表し、R2は水素原子またはハロゲン原子を表し、R3はC1−C3アルキル基を表す。)
で示されるジエン化合物と酸とを反応させることを特徴とする式(2)
Figure 0004239473
(式中、R1およびR2は前記と同じ意味を表す。)
で示されるピリドン化合物の製造法。
Formula (1)
Figure 0004239473
(In the formula, R 1 represents a halogen atom, a cyano group or a nitro group, R 2 represents a hydrogen atom or a halogen atom, and R 3 represents a C1-C3 alkyl group.)
Wherein the diene compound represented by formula (2) is reacted with an acid.
Figure 0004239473
(In the formula, R 1 and R 2 represent the same meaning as described above.)
The manufacturing method of the pyridone compound shown by these.
式(3)
Figure 0004239473
(式中、R1はハロゲン原子、シアノ基またはニトロ基を表し、R2は水素原子またはハロゲン原子を表す。)
で示されるアミド化合物と式(4)
3 2NCH=CH−CH=N+3 2- (4)
(式中、R3はC1−C3アルキル基を表し、Aはハロゲン原子を表す。)
で示される1,5−ジアザペンタジエニウム塩とを反応させ、次いで酸と反応させることを特徴とする式(2)
Figure 0004239473
(式中、R1およびR2は前記と同じ意味を表す。)
で示されるピリドン化合物の製造法。
Formula (3)
Figure 0004239473
(In the formula, R 1 represents a halogen atom, a cyano group or a nitro group, and R 2 represents a hydrogen atom or a halogen atom.)
An amide compound represented by formula (4)
R 3 2 NCH═CH—CH═N + R 3 2 A (4)
(In the formula, R 3 represents a C1-C3 alkyl group, and A represents a halogen atom.)
And a 1,5-diazapentadienium salt represented by the formula (2), and then reacting with an acid.
Figure 0004239473
(In the formula, R 1 and R 2 represent the same meaning as described above.)
The manufacturing method of the pyridone compound shown by these.
酸が脂肪族カルボン酸であることを特徴する請求項1または請求項2記載のピリドン化合物の製造法。The method for producing a pyridone compound according to claim 1 or 2, wherein the acid is an aliphatic carboxylic acid. 酸が酢酸であることを特徴とする請求項1または2記載のピリドン化合物の製造法。The method for producing a pyridone compound according to claim 1 or 2, wherein the acid is acetic acid. 式(1)
Figure 0004239473
(式中、R1、R2およびR3は請求項1と同じ意味を表す。)
で示されるジエン化合物。
Formula (1)
Figure 0004239473
(Wherein R 1 , R 2 and R 3 represent the same meaning as in claim 1).
A diene compound represented by:
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