申请人:SUMITOMO SEIKA CHEMICALS CO., LTD.
公开号:EP0572712A2
公开(公告)日:1993-12-08
A 2-alkylthiobenzaldehyde of general formula (I) is reacted with a halo compound of general formula (II) to produce a 2-substituted benzo[b]thiophene of general formula (III).
wherein R1 means an alkyl group of 1 to 4 carbon atoms.
wherein X1 means Cl or Br; Y means -CO2 H, -CO2R2, -COR2, -CONH2 or -CN; R2 means an alkyl group of 1 to 4 carbon atoms.
wherein Y is as defined above.
The process of this invention is of great economic and industrial value, for 2-acetylbenzo[b]thiophene and 2-benzo[b]thiophenecarboxylic acid, which are important intermediates for drugs and agricultural chemicals among others, can be obtained in a simple manner, easily and in high yield.
通式(I)的 2-烷基硫代苯甲醛与通式(II)的卤代化合物反应生成通式(III)的 2-取代苯并[b]噻吩。
其中 R1 指 1 至 4 个碳原子的烷基。
其中 X1 指 Cl 或 Br;Y 指 -CO2 H、-CO2R2、-COR2、-CONH2 或 -CN;R2 指 1 至 4 个碳原子的烷基。
其中 Y 如上定义。
本发明的工艺具有极大的经济和工业价值,因为 2-乙酰基苯并[b]噻吩和 2-苯并[b]噻吩羧酸是药物和农药等的重要中间体,可以通过简单的方法轻松高产地获得。