Compounds of the formula:
wherein Y is
in which R is hydrogen, methyl, chloro or bromo, the R substitution being at the 3, or 5 positions of the thiophene ring,
R1 is hydrogen, a lower alkyl group having 1 to 4 carbon atoms, a lower alkoxy group having from 1 to 4 carbon atoms, chloro, fluoro or bromo, the R1 substitution being at the ortho, meta or para positions of the aroyl group, and
R2 is hydrogen or a lower alkyl group having from 1 to 4 carbon atoms.
These compounds are used as intermediates for the preparation of the corresponding 1-carboxylic acid compounds by hydrolysis, the latter compounds being pharmaceutically useful.
式中的化合物:
其中 Y 是
其中 R 为氢、甲基、
氯或
溴,R 取代位于
噻吩环的 3 或 5 位、
R1 是氢、1 至 4 个碳原子的低级烷基、1 至 4 个碳原子的低级烷氧基、
氯、
氟或
溴,R1 的取代位在芳基的正位、偏位或对位上,以及
R2 是氢或具有 1 至 4 个碳原子的低级烷基。
这些化合物可用作中间体,通过
水解制备相应的 1-
羧酸化合物,后一种化合物具有药用价值。