申请人:SUMITOMO SEIKA CHEMICALS CO., LTD.
公开号:EP1695972A1
公开(公告)日:2006-08-30
The present invention provides a process for producing a 2-acylthiophene compound which has a low content of the 3-isomer generated as a by-product, the process comprising reacting a thiophene compound represented by formula (1) :
wherein R1 is a hydrogen atom, a C1-6 alkyl group, a phenyl group, or a halogen atom, with at least one member selected from the group consisting of acid anhydrides represented by formula (2):
wherein R2 is a C1-6 alkyl group or a phenyl group, and
acid halides represented by formula (3):
wherein R2 is as defined above and X is a halogen atom,
in the presence of a solid acid catalyst at a temperature less than 75°C in the absence of solvent, thus producing a 2-acylthiophene compound represented by formula (4):
wherein R1 and R2 are as defined above.
本发明提供了一种生产 2-酰基噻吩化合物的工艺,其副产物 3-异构体的含量较低,该工艺包括使式(1)代表的噻吩化合物发生反应:
其中 R1 是氢原子、C1-6 烷基、苯基或卤素原子,与至少一个选自由式(2)表示的酸酐组成的组的成员反应:
其中 R2 是 C1-6 烷基或苯基,以及
由式 (3) 代表的酸卤化物:
其中 R2 如上定义,X 为卤素原子、
在无溶剂、温度低于 75°C 的条件下,在固体酸催化剂存在下,生成式(4)代表的 2-酰基噻吩化合物:
其中 R1 和 R2 如上定义。