申请人:Sanofi
公开号:US04487931A1
公开(公告)日:1984-12-11
The present invention provides a multistep process for the preparation of 2-(thien-2-yl)- and 2-(thien-3-yl)-ethylamine intermediates of the general formula:- ##STR1## in which R.sub.1, in the 2-, 3-, 4- or 5-position, is a hydrogen or halogen atom, a nitro, amino, cyano or carboxyl group, a linear or branched alkyl or alkoxy radical or a heterocyclic or non-heterocyclic aromatic radical, which is optionally mono- or polysubstituted, R.sub.2 is a hydrogen atom, a linear or branched alkyl radical or a heterocyclic or non-heterocyclic aromatic radical, which is optionally mono- or polysubstituted, and Ar is a heterocyclic or non-heterocyclic aromatic radical, which is optionally mono- or polysubstituted, when the aminoethyl radical is in the two position and the radical R.sub.1 is in the 4- or 5-position, the above intermediates can be converted into 4,5,6,7-tetrahydrothieno[3,2-c]pyridine derivatives according to a procedure set forth in U.S. Pat. No. 4,127,580. When the aminoethyl radical is in the 3-position and the radical R.sub.1 is in the 4- or 5-position, the above intermediates can be converted into 4,5,6,7-tetrahydrothieno[2,3-c]pyridine derivatives according to a procedure set forth in U.S. Pat. No. 4,127,580. Both sets of tetrahydrothieno pyridine final products possess anti-inflammatory, vasodilator and blood platelet aggregation inhibition activity.
本发明提供了一种多步法制备2-(噻吩-2-基)-和2-(噻吩-3-基)-乙胺中间体的通式为:- ##STR1## 其中R.sub.1在2、3、4或5位置是氢或卤素原子,硝基、氨基、氰基或羧基、线性或支链烷基或烷氧基或杂环或非杂环芳基,可选地单取代或多取代,R.sub.2是氢原子、线性或支链烷基或杂环或非杂环芳基,可选地单取代或多取代,Ar是杂环或非杂环芳基,可选地单取代或多取代,当氨基乙基基团在2位时,基团R.sub.1在4-或5-位置时,上述中间体可以按照U.S.专利4,127,580所述的程序转化为4,5,6,7-四氢噻吩[3,2-c]吡啶衍生物。当氨基乙基基团在3位时,基团R.sub.1在4-或5-位置时,上述中间体可以按照U.S.专利4,127,580所述的程序转化为4,5,6,7-四氢噻吩[2,3-c]吡啶衍生物。两组四氢噻吩吡啶最终产物均具有抗炎、扩血管和抑制血小板聚集活性。