5-benzoyl-7-halo-1,2-dihydro-3H-pyrrolo[1,2-a]-pyrrole-1-carboxylic acids, represented by the formula ##STR1## and the pharmaceutically acceptable non-toxic esters and salts thereof, wherein: R is hydrogen or lower alkyl; X is hydrogen, lower alkyl, lower alkoxyl, lower alkoxycarbonyl, carboxyl, lower alkylcarbonyl, sulfonic acid, sulfonic acid alkyl ester, fluoro, chloro, or bromo; and Y is chloro or bromo, which are novel, and 5-benzoyl-1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1-carboxylic acids which are represented by the formula ##STR2## wherein X and R are as above defined except that X cannot be chloro or bromo, are prepared by decarboxylation of the corresponding 1,1 dicarboxylates. Intermediates in said preparation are also disclosed.
5-苯甲酰基-7-卤代-1,2-二氢-
3H-吡咯并[1,2-a]-
吡咯-1-
羧酸及其药学上可接受的无毒酯和盐,其
化学式为 ##STR1## 其中:R为氢或低碳基;X为氢,低碳基,低氧基,低氧羧基,羧基,低碳酰基,
磺酸基,
磺酸烷基酯,
氟,
氯或
溴;Y为
氯或
溴。这些化合物是新颖的。5-苯甲酰基-1,2-二氢-
3H-吡咯并[1,2-a]-
吡咯-1-
羧酸及其药学上可接受的无毒酯和盐,其
化学式为 ##STR2## 其中X和R的定义与上述相同,除了X不能是
氯或
溴,它们是通过相应的1,1-二
羧酸盐的脱羧制备的。该制备过程中的中间体也被揭示。