The invention relates to a novel process for the preparation of rac-6-Chloro-2,3,4,9-tetrahydro-1H-carbazole-1-carboxamide (I) in pharmaceutically acceptable polymorphic form, through the conversion of a 3-bromo-2-oxo-cyclohexanecarboxylic acid alkyl ester into 6-chloro-2,3,4,9-tetrahydro-1H-carbazole-1-carboxylic acid alkyl ester, which in turn is processed to yield the final product.
本发明涉及一种新工艺,通过将 3-溴-2-氧代-
环己烷羧酸烷基酯转化为
6-氯-2,3,4,9-四氢-1H-咔唑-1-羧酸烷基酯,制备药学上可接受的多晶型 rac-6-Chloro-2,3,4,9-tetrahydro-1H-carbazole-1-carboxamide (I)。