JPH0789936A - Production of 1-alkylhexahydroazepine-4-one - Google Patents

Production of 1-alkylhexahydroazepine-4-one

Info

Publication number
JPH0789936A
JPH0789936A JP26187893A JP26187893A JPH0789936A JP H0789936 A JPH0789936 A JP H0789936A JP 26187893 A JP26187893 A JP 26187893A JP 26187893 A JP26187893 A JP 26187893A JP H0789936 A JPH0789936 A JP H0789936A
Authority
JP
Japan
Prior art keywords
compound
reaction
formula
yield
alkylhexahydroazepin
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.)
Granted
Application number
JP26187893A
Other languages
Japanese (ja)
Other versions
JP3819444B2 (en
Inventor
Masaaki Honda
正明 本多
Toshihiro Kudai
敏弘 工代
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koei Chemical Co Ltd
Original Assignee
Koei Chemical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Koei Chemical Co Ltd filed Critical Koei Chemical Co Ltd
Priority to JP26187893A priority Critical patent/JP3819444B2/en
Publication of JPH0789936A publication Critical patent/JPH0789936A/en
Application granted granted Critical
Publication of JP3819444B2 publication Critical patent/JP3819444B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To provide a method for producing the compound which is useful as an intermediate for medicines in a higher yield and selectivity than those by the prior art. CONSTITUTION:The cyclocondensation reaction of a compound of the formula I (R<1> to R<3> are 1-4 C alkyl) is effected in the presence of a base, preferably an alkali hydride or an alkali t-butoxide in an inert gas atmosphere over 100 deg.C, preferably at 130 to 160 deg.C, then the product is treated with an acid to provide a 1-alkylhexahydroazepine-4-one. The compound of the formula I is obtained by reaction of an alkylamine of the formula: R<1>NH2 with a compound of the formula III followed by the reaction of the product of the formula IV with an acrylic acid ester of the formula V.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、各種の医薬品の中間体
として有用な1−アルキルヘキサハイドロアゼピン−4
−オンを製造する方法に関する。
FIELD OF THE INVENTION The present invention relates to 1-alkylhexahydroazepine-4 useful as an intermediate for various pharmaceuticals.
-Relating to a method of manufacturing an on.

【0002】[0002]

【従来の技術】1−アルキルヘキサハイドロアゼピン−
4−オンは医薬品の中間体として有用な化合物であり、
例えば、特開昭47−16436号公報に記載された方
法により有用な医薬品に変換される。
2. Description of the Related Art 1-Alkylhexahydroazepine
4-one is a compound useful as an intermediate for pharmaceuticals,
For example, it is converted into a useful drug by the method described in JP-A-47-16436.

【0003】従来、1−アルキルヘキサハイドロアゼピ
ン−4−オンの製造法としては、N−メチルピペリドン
を環拡大する方法(Chemical Abstrac
ts,Vol.69,86857u(1968)、同,
Vol.58,12512e(1963))が知られて
いる。しかし、この方法は、収率が低いという問題があ
る。従って、さらに効率のよい1−アルキルヘキサハイ
ドロアゼピン−4−オンの製造方法の開発が望まれてい
る。
Conventionally, as a method for producing 1-alkylhexahydroazepin-4-one, a method of ring-expanding N-methylpiperidone (Chemical Abstract) has been used.
ts, Vol. 69, 86857u (1968), the same,
Vol. 58,12512e (1963)) is known. However, this method has a problem of low yield. Therefore, development of a more efficient method for producing 1-alkylhexahydroazepin-4-one is desired.

【0004】N−(2−アルコキシカルボニルエチル)
−N−(3−アルコキシカルボニルプロピル)アルキル
アミンを製造原料とする1−アルキルヘキサハイドロア
ゼピン−4−オンの製造法は、文献未記載の方法であ
る。この製造原料の類似化合物であるN−(2−アルコ
キシカルボニルエチル)−N−(3−アルコキシカルボ
ニルプロピル)ベンジルアミンを用いる1−ベンジルヘ
キサハイドロアゼピン−4−オンの製造法は公知である
(Bull.Chem.Soc.Jpn.,29
(5),631(1956))。この方法は、ナトリウ
ムエチラートの存在下で製造原料を環化縮合し、その後
反応生成物を酸処理する方法である。
N- (2-alkoxycarbonylethyl)
The production method of 1-alkylhexahydroazepin-4-one using -N- (3-alkoxycarbonylpropyl) alkylamine as a production raw material is a method not described in the literature. A method for producing 1-benzylhexahydroazepin-4-one using N- (2-alkoxycarbonylethyl) -N- (3-alkoxycarbonylpropyl) benzylamine, which is a similar compound to this production raw material, is known (Bull). Chem. Soc. Jpn., 29.
(5), 631 (1956)). This method is a method in which a raw material for production is cyclocondensed in the presence of sodium ethylate, and then the reaction product is treated with an acid.

【0005】本発明者は、N−(2−アルコキシカルボ
ニルエチル)−N−(3−アルコキシカルボニルプロピ
ル)アルキルアミンを1−アルキルヘキサハイドロアゼ
ピン−4−オンの製造原料として選択し、前記Bul
l.Chem.Soc.Jpn.記載の方法と同様にし
て、該製造原料をナトリウムエチラートを用いて環化縮
合(ディークマン縮合)した後、その反応生成物を鉱酸
で処理してケン化、脱炭酸することにより1−アルキル
ヘキサハイドロアゼピン−4−オンを得た。しかし、こ
の方法には、該製造原料の分解が進行してしまう等の不
都合が生じ、上記目的化合物の収率が極めて低いという
問題がある(後述の比較例1参照)。
The present inventor selected N- (2-alkoxycarbonylethyl) -N- (3-alkoxycarbonylpropyl) alkylamine as a raw material for the production of 1-alkylhexahydroazepin-4-one, and said
l. Chem. Soc. Jpn. In the same manner as the described method, the production raw material is subjected to cyclization condensation (Diekmann condensation) using sodium ethylate, and then the reaction product is treated with a mineral acid to saponify and decarboxylate. Alkylhexahydroazepin-4-one was obtained. However, this method has a problem that the yield of the above-mentioned target compound is extremely low (see Comparative Example 1 to be described later) because of inconveniences such as decomposition of the raw material for production.

【0006】[0006]

【発明が解決しようとする課題】本発明の目的は、N−
(2−アルコキシカルボニルエチル)−N−(3−アル
コキシカルボニルプロピル)アルキルアミンを環化縮合
した後、反応生成物を酸処理して1−アルキルヘキサハ
イドロアゼピン−4−オンを製造する法を改良して、高
収率で上記目的化合物を製造する方法を提供することに
ある。
The object of the present invention is to provide N-
An improved method for producing 1-alkylhexahydroazepin-4-one by cyclocondensing (2-alkoxycarbonylethyl) -N- (3-alkoxycarbonylpropyl) alkylamine and then treating the reaction product with an acid. Then, it is to provide a method for producing the above target compound in a high yield.

【0007】[0007]

【課題を解決するための手段】本発明者は、上記課題を
解決すべく鋭意検討した結果、製造原料N−(2−アル
コキシカルボニルエチル)−N−(3−アルコキシカル
ボニルプロピル)アルキルアミンの環化縮合を不活性ガ
ス雰囲気下及び/又は特定の塩基の存在下で行うと、1
−アルキルヘキサハイドロアゼピン−4−オンを高収率
で製造できることを見出し本発明を完成するに至った。
Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventor has found that the ring of the starting material N- (2-alkoxycarbonylethyl) -N- (3-alkoxycarbonylpropyl) alkylamine When the chemical condensation is carried out in an inert gas atmosphere and / or in the presence of a specific base, 1
The inventors have found that -alkylhexahydroazepin-4-one can be produced in high yield, and have completed the present invention.

【0008】即ち、本発明は不活性ガス雰囲気下、塩基
の存在下で、一般式(1):
That is, according to the present invention, the compound represented by the general formula (1):

【化5】 (式中、R1、R2及びR3は炭素数1〜4のアルキル基
を示す。)で表わされる化合物を環化縮合した後、反応
生成物を酸処理することを特徴とする一般式(2):
[Chemical 5] (Wherein R 1 , R 2 and R 3 represent an alkyl group having 1 to 4 carbon atoms), the reaction product is acid-treated after cyclocondensation of the compound. (2):

【化6】 (式中、R1は前記に同じ。)で表わされる1−アルキ
ルヘキサハイドロアゼピン−4−オンの製造法、並びに
水素化アルカリ又はt−ブトキシアルカリの存在下で、
前記一般式(1)で表わされる化合物を環化縮合した
後、反応生成物を酸処理することを特徴とする前記一般
式(2)で表わされる1−アルキルヘキサハイドロアゼ
ピン−4−オンの製造法に関する。
[Chemical 6] (In the formula, R 1 is the same as above.) In the production method of 1-alkylhexahydroazepin-4-one, and in the presence of alkali hydride or t-butoxyalkali,
After the cyclocondensation of the compound represented by the general formula (1), the reaction product is treated with an acid to produce a 1-alkylhexahydroazepin-4-one represented by the general formula (2). Concerning the law.

【0009】本発明の製造原料として用いられる一般式
(1)で表わされる化合物のR1、R2及びR3で示され
る炭素数1〜4のアルキル基としては、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、sec−ブチル基、t−ブチ
ル基が挙げられる。一般式(1)で表わされる化合物の
具体例としては、N−(2−メトキシカルボニルエチ
ル)−N−(3−メトキシカルボニルプロピル)メチル
アミン、N−(2−エトキシカルボニルエチル)−N−
(3−エトキシカルボニルプロピル)メチルアミン、N
−(2−プロポキシカルボニルエチル)−N−(3−プ
ロポキシカルボニルプロピル)メチルアミン、N−(2
−ブトキシカルボニルエチル)−N−(3−ブトキシカ
ルボニルプロピル)メチルアミン、及び上記N−(2−
アルコキシカルボニルエチル)−N−(3−アルコキシ
カルボニルプロピル)基を有するエチルアミン、プロピ
ルアミン、ブチルアミンが挙げられる。
Examples of the alkyl group having 1 to 4 carbon atoms represented by R 1 , R 2 and R 3 of the compound represented by the general formula (1) used as a raw material for the production of the present invention include a methyl group, an ethyl group, n-propyl group, isopropyl group, n-
Examples thereof include a butyl group, an isobutyl group, a sec-butyl group, and a t-butyl group. Specific examples of the compound represented by the general formula (1) include N- (2-methoxycarbonylethyl) -N- (3-methoxycarbonylpropyl) methylamine and N- (2-ethoxycarbonylethyl) -N-.
(3-Ethoxycarbonylpropyl) methylamine, N
-(2-propoxycarbonylethyl) -N- (3-propoxycarbonylpropyl) methylamine, N- (2
-Butoxycarbonylethyl) -N- (3-butoxycarbonylpropyl) methylamine, and the above N- (2-
Examples include ethylamine, propylamine, and butylamine having an alkoxycarbonylethyl) -N- (3-alkoxycarbonylpropyl) group.

【0010】一般式(1)の化合物は、一般式(3):The compound of the general formula (1) has the general formula (3):

【化7】 (式中、R1は前記に同じ。)のアルキルアミンと一般
式(4):
[Chemical 7] (Wherein R 1 is the same as above) and the general formula (4):

【化8】 (式中、R2は前記に同じ。)の化合物との反応により
得られる一般式(5):
[Chemical 8] (Wherein R 2 is the same as above), which is obtained by the reaction with the compound of the general formula (5):

【化9】 (式中、R1及びR2は前記に同じ。)の化合物をさらに
一般式(6):
[Chemical 9] (In the formula, R 1 and R 2 are the same as described above.) The compound of the general formula (6):

【化10】 (式中、R3は前記に同じ。)のアクリル酸エステルと
反応することにより製造される化合物である。
[Chemical 10] (In the formula, R 3 is the same as above.) A compound produced by reacting with an acrylic ester.

【0011】本発明の環化縮合は、空気中の酸素が反応
に悪影響を及ぼし収率が低下するため、希ガス、窒素の
ような不活性ガス雰囲気下で行われ、それによって本発
明の目的化合物の収率(以下、単に収率という。)が向
上する。また、塩基として水素化アルカリ又はt−ブト
キシアルカリを用いた場合には、空気雰囲気下でも本発
明の目的を達成することができる。
The cyclocondensation of the present invention is carried out in an atmosphere of an inert gas such as a rare gas or nitrogen, because oxygen in the air adversely affects the reaction to lower the yield, and thus the object of the present invention. The yield of the compound (hereinafter, simply referred to as yield) is improved. When an alkali hydride or t-butoxy alkali is used as the base, the object of the present invention can be achieved even in an air atmosphere.

【0012】本発明の環化縮合に用いる塩基は、好まし
くは水素化アルカリ又はt−ブトキシアルカリであり、
例えば水素化アルカリとしては、水素化ナトリウム、水
素化カリウム、t−ブトキシアルカリとしては、t−ブ
トキシナトリウム、t−ブトキシカリウム等を挙げるこ
とができる。その他の一般的にディ−クマン縮合に用い
られる塩基、例えばナトリウムメチラート、ナトリウム
エチラート、金属ナトリウム等を用いることができる
が、該製造原料の分解が生じ易く収率が低下する傾向が
見られる。環化縮合に用いられる塩基の量は、該製造原
料に対して1〜1.5モルの範囲が好ましい。塩基の量
が該製造原料に対して1モルを下回ると、反応が進行し
難く収率が低下する傾向があり、塩基の量が該製造原料
に対して1.5モルを上回ると、該製造原料や反応中間
体の分解が生じ収率が低下する傾向がある。
The base used in the cyclocondensation of the present invention is preferably an alkali hydride or a t-butoxy alkali,
Examples of the alkali hydride include sodium hydride and potassium hydride, and examples of the t-butoxy alkali include t-butoxy sodium and t-butoxy potassium. Other bases generally used for Dieckmann condensation, such as sodium methylate, sodium ethylate, and sodium metal, can be used, but the production raw materials tend to decompose and the yield tends to decrease. . The amount of the base used for the cyclocondensation is preferably in the range of 1 to 1.5 mol with respect to the production raw material. If the amount of the base is less than 1 mol with respect to the production raw material, the reaction is difficult to proceed and the yield tends to decrease. If the amount of the base exceeds 1.5 mol with respect to the production raw material, the production Decomposition of raw materials and reaction intermediates tends to occur, and the yield tends to decrease.

【0013】また、本発明の環化縮合においては、通
常、芳香族炭化水素等の不活性溶媒が使用される。芳香
族炭化水素としては、沸点が100℃をこえる芳香族炭
化水素を挙げることができ、例えばトルエン、キシレン
等を挙げることができる。不活性溶媒の量は、工業的な
取扱いの観点から該製造原料に対して1〜30重量部、
好ましくは5〜15重量部の範囲である。不活性溶媒の
量が該製造原料の1重量部を下回ると、該製造原料の分
解、重合が起こり収率が低下する傾向がある。
In the cyclization condensation of the present invention, an inert solvent such as aromatic hydrocarbon is usually used. Examples of aromatic hydrocarbons include aromatic hydrocarbons having a boiling point of higher than 100 ° C., such as toluene and xylene. From the viewpoint of industrial handling, the amount of the inert solvent is 1 to 30 parts by weight based on the raw material for production,
It is preferably in the range of 5 to 15 parts by weight. If the amount of the inert solvent is less than 1 part by weight of the raw material for production, decomposition and polymerization of the raw material for production tend to occur and the yield tends to decrease.

【0014】本発明の環化縮合の反応温度は、通常10
0℃以上、好ましくは130〜160℃の範囲である。
反応温度が低いと、反応で副生する低級アルコ−ルが反
応を妨げ、収率の低下を引き起こす。反応は通常1〜1
0時間で終了し、製造原料である一般式(1)の化合物
がほぼ消費される。
The reaction temperature for the cyclocondensation of the present invention is usually 10
The temperature is 0 ° C or higher, preferably 130 to 160 ° C.
When the reaction temperature is low, lower alcohol, which is a by-product of the reaction, hinders the reaction and causes a decrease in yield. Reaction is usually 1-1
The process is completed in 0 hours, and the compound of the general formula (1), which is a raw material for production, is almost consumed.

【0015】上記環化縮合によって得られる反応生成物
は、いわゆるディ−クマン縮合生成物である。
The reaction product obtained by the above cyclization condensation is a so-called Dieckmann condensation product.

【0016】環化縮合によって得られた反応生成物を酸
処理することにより、アルコキシカルボニル基がケン
化、脱炭酸されて、相当する一般式(2)の1−アルキ
ルヘキサハイドロアゼピン−4−オンが得られる。
By treating the reaction product obtained by the cyclization condensation with an acid, the alkoxycarbonyl group is saponified and decarboxylated to give the corresponding 1-alkylhexahydroazepin-4-one of the general formula (2). Is obtained.

【0017】上記酸処理の好ましい実施態様としては、
酸を含む水溶液中に環化縮合反応後の反応液を滴下し、
分液して得られた水層を加熱する。酸処理後、処理液を
アルカリで中和し有機溶剤で抽出した後、有機層を蒸留
して一般式(2)の1−アルキルヘキサハイドロアゼピ
ン−4−オンが収得される。
As a preferred embodiment of the above acid treatment,
The reaction solution after the cyclocondensation reaction is dropped into an aqueous solution containing an acid,
The aqueous layer obtained by liquid separation is heated. After the acid treatment, the treatment liquid is neutralized with alkali and extracted with an organic solvent, and then the organic layer is distilled to obtain 1-alkylhexahydroazepin-4-one of the general formula (2).

【0018】さらに詳しくは、酸としては、塩酸、硫酸
等の鉱酸が好適に使用される。酸の使用量は、一般式
(1)の原料化合物1モルに対して2当量以上が好まし
く、さらに好ましくは3〜4当量である。酸の使用量が
2当量より少ないと、反応が進行し難く収率が低下す
る。処理温度は通常80℃以上、好ましくは90〜12
0℃の範囲である。処理温度が80℃より低いと反応の
進行が遅くなり長時間を要するため好ましくない。反応
後の中和に使用するアルカリとしては、アルカリ金属の
水酸化物、炭酸塩等、具体的には水酸化ナトリウム、水
酸化カリウム、炭酸ナトリウム、炭酸カリウム等が使用
できる。
More specifically, mineral acids such as hydrochloric acid and sulfuric acid are preferably used as the acid. The amount of the acid used is preferably 2 equivalents or more, more preferably 3 to 4 equivalents, relative to 1 mol of the starting compound of the general formula (1). If the amount of the acid used is less than 2 equivalents, the reaction is difficult to proceed and the yield decreases. The treatment temperature is usually 80 ° C. or higher, preferably 90 to 12
It is in the range of 0 ° C. If the treatment temperature is lower than 80 ° C., the progress of the reaction is delayed and it takes a long time, which is not preferable. As the alkali used for the neutralization after the reaction, alkali metal hydroxides, carbonates and the like, specifically sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate and the like can be used.

【0019】[0019]

【実施例】以下実施例を示しさらに本発明の詳細を説明
するが、本発明はこれら実施例に限定されるものではな
い。 実施例1 ナトリウムエチラート29.9g(0.44モル)とキ
シレン976gとの混合物を窒素雰囲気下、140℃に
昇温した。次いで、生じるエタノールを抜きながらN−
(2−エトキシカルボニルエチル)−N−(3−エトキ
シカルボニルプロピル)メチルアミン98g(0.40
モル)とキシレン542gの混合液を滴下し、滴下終了
後、140℃で2.5時間加熱した。冷却後、反応液を
26%塩酸中に30℃以下に保ちながら滴下した。これ
を分液し、分液により得られた水層を昇温して90〜1
00℃で5時間保った。炭酸カリウムで中和した後、ク
ロロホルム800gで抽出した。濃縮後、その残渣を蒸
留したところ、沸点80℃/10mmHgの留分から1
−メチルヘキサハイドロアゼピン−4−オン16.5g
(収率32.5%)、N−メチルピロリドン9.7g
(収率24.5%)を得た。
The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. Example 1 A mixture of 29.9 g (0.44 mol) of sodium ethylate and 976 g of xylene was heated to 140 ° C. under a nitrogen atmosphere. Then, while removing the produced ethanol, N-
(2-Ethoxycarbonylethyl) -N- (3-ethoxycarbonylpropyl) methylamine 98 g (0.40
Mol) and xylene 542 g were added dropwise, and after completion of the addition, the mixture was heated at 140 ° C. for 2.5 hours. After cooling, the reaction solution was added dropwise to 26% hydrochloric acid while maintaining the temperature at 30 ° C or lower. This was separated, and the aqueous layer obtained by the separation was heated to 90 to 1
It was kept at 00 ° C for 5 hours. After neutralizing with potassium carbonate, it was extracted with 800 g of chloroform. After concentration, the residue was distilled to obtain 1 from a fraction with a boiling point of 80 ° C / 10 mmHg.
-Methylhexahydroazepin-4-one 16.5 g
(Yield 32.5%), N-methylpyrrolidone 9.7 g
(Yield 24.5%) was obtained.

【0020】実施例2 実施例1においてナトリウムエチラートの代わりにt−
ブトキシカリウム49.4g(0.44モル)を使用し
た以外は実施例1と同様にして反応及び処理を行った。
その結果、1−メチルヘキサハイドロアゼピン−4−オ
ン34.0g(収率66.8%)、N−メチルピロリド
ン1.3g(収率3.2%)を得た。
Example 2 In Example 1, t- was used instead of sodium ethylate.
The reaction and treatment were conducted in the same manner as in Example 1 except that 49.4 g (0.44 mol) of butoxypotassium was used.
As a result, 34.0 g of 1-methylhexahydroazepin-4-one (yield 66.8%) and 1.3 g of N-methylpyrrolidone (yield 3.2%) were obtained.

【0021】実施例3 実施例1においてナトリウムエチラートの代わりに純度
64%水素化ナトリウム16.5g(0.44モル)と
メタノール3gを使用した以外は実施例1と同様にして
反応及び処理を行った。その結果、1−メチルヘキサハ
イドロアゼピン−4−オン34.3g(収率67.5
%)、N−メチルピロリドン1.7g(収率4.2%)
を得た。
Example 3 The reaction and treatment were carried out in the same manner as in Example 1 except that 16.5 g (0.44 mol) of 64% pure sodium hydride and 3 g of methanol were used in place of sodium ethylate. went. As a result, 34.3 g of 1-methylhexahydroazepin-4-one (yield 67.5) was obtained.
%), 1.7 g of N-methylpyrrolidone (yield 4.2%)
Got

【0022】実施例4 実施例3において反応を窒素雰囲気下で行う代わりに空
気中で行った以外は、実施例3と同様にして反応及び処
理を行った。その結果、1−メチルヘキサハイドロアゼ
ピン−4−オン23.0g(収率45.2%)、N−メ
チルピロリドン2.5g(収率6.2%)を得た。
Example 4 The reaction and treatment were carried out in the same manner as in Example 3 except that the reaction was carried out in air instead of in a nitrogen atmosphere. As a result, 1-methylhexahydroazepin-4-one 23.0 g (yield 45.2%) and N-methylpyrrolidone 2.5 g (yield 6.2%) were obtained.

【0023】比較例 実施例1において反応を窒素雰囲気下で行う代わりに空
気中で行った以外は、実施例1と同様にして反応及び処
理を行った。その結果、1−メチルヘキサハイドロアゼ
ピン−4−オンg2.8(収率5.6%)、N−メチル
ピロリドン1.6g(収率4.1%)を得た。
Comparative Example The reaction and treatment were carried out in the same manner as in Example 1 except that the reaction was carried out in air instead of in a nitrogen atmosphere. As a result, 1-methylhexahydroazepin-4-one g 2.8 (yield 5.6%) and N-methylpyrrolidone 1.6 g (yield 4.1%) were obtained.

【0024】[0024]

【発明の効果】本発明によれば、環化縮合を不活性ガス
雰囲気下で行ったので、医薬品の中間体として有用な1
−アルキルヘキサハイドロアゼピン−4−オンを従来方
法に比べて高収率で製造することができた。また、環化
縮合を水素化アルカリ又はt−ブトキシアルカリの存在
下で行ったので、1−アルキルヘキサハイドロアゼピン
−4−オンを従来方法に比べて高収率、高選択率で製造
することができた。
INDUSTRIAL APPLICABILITY According to the present invention, since cyclization condensation is carried out in an inert gas atmosphere, it is useful as an intermediate for pharmaceuticals.
-Alkylhexahydroazepin-4-one could be produced in a higher yield than the conventional method. In addition, since the cyclization condensation is carried out in the presence of alkali hydride or t-butoxy alkali, 1-alkylhexahydroazepin-4-one can be produced in a higher yield and a higher selectivity than the conventional method. did it.

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 不活性ガス雰囲気下、塩基の存在下で、
一般式(1): 【化1】 (式中、R1、R2及びR3は炭素数1〜4のアルキル基
を示す。)で表わされる化合物を環化縮合した後、反応
生成物を酸処理することを特徴とする一般式(2): 【化2】 (式中、R1は前記に同じ。)で表わされる1−アルキ
ルヘキサハイドロアゼピン−4−オンの製造法。
1. An inert gas atmosphere in the presence of a base,
General formula (1): (Wherein R 1 , R 2 and R 3 represent an alkyl group having 1 to 4 carbon atoms), the reaction product is acid-treated after cyclocondensation of the compound. (2): (In the formula, R 1 is the same as above.) A method for producing a 1-alkylhexahydroazepin-4-one.
【請求項2】 水素化アルカリ又はt−ブトキシアルカ
リの存在下で、一般式(1): 【化3】 (式中、R1、R2及びR3は炭素数1〜4のアルキル基
を示す。)で表わされる化合物を環化縮合した後、反応
生成物を酸処理することを特徴とする一般式(2): 【化4】 (式中、R1は前記に同じ。)で表わされる1−アルキ
ルヘキサハイドロアゼピン−4−オンの製造法。
2. A compound represented by the general formula (1): embedded image in the presence of an alkali hydride or an alkali t-butoxy group. (Wherein R 1 , R 2 and R 3 represent an alkyl group having 1 to 4 carbon atoms), the reaction product is acid-treated after cyclocondensation of the compound. (2): (In the formula, R 1 is the same as above.) A method for producing a 1-alkylhexahydroazepin-4-one.
【請求項3】 不活性ガス雰囲気下で環化縮合を行うこ
とを特徴とする請求項2記載の1−アルキルヘキサハイ
ドロアゼピン−4−オンの製造法。
3. The method for producing 1-alkylhexahydroazepin-4-one according to claim 2, wherein the cyclocondensation is carried out in an inert gas atmosphere.
JP26187893A 1993-09-24 1993-09-24 Process for producing 1-alkylhexahydroazepin-4-one Expired - Fee Related JP3819444B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26187893A JP3819444B2 (en) 1993-09-24 1993-09-24 Process for producing 1-alkylhexahydroazepin-4-one

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26187893A JP3819444B2 (en) 1993-09-24 1993-09-24 Process for producing 1-alkylhexahydroazepin-4-one

Publications (2)

Publication Number Publication Date
JPH0789936A true JPH0789936A (en) 1995-04-04
JP3819444B2 JP3819444B2 (en) 2006-09-06

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ID=17368023

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Country Link
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100421282B1 (en) * 2001-08-22 2004-03-09 부광약품 주식회사 Process for preparing 1-methylhexahydro-4-azepinone hydrochloride
KR100426534B1 (en) * 2001-09-03 2004-04-28 한올제약주식회사 An improved synthetic method of azelastine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100421282B1 (en) * 2001-08-22 2004-03-09 부광약품 주식회사 Process for preparing 1-methylhexahydro-4-azepinone hydrochloride
KR100426534B1 (en) * 2001-09-03 2004-04-28 한올제약주식회사 An improved synthetic method of azelastine

Also Published As

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