申请人:Hoffmann-La Roche Inc.
公开号:US04178289A1
公开(公告)日:1979-12-11
A process for the preparation of 6-chloro-.alpha.-methylcarbazole-2-acetic acid from 6-chloro-.alpha.-hydroxy-.alpha.-methylcarbazole-2-acetic acid and/or 6-chloro-.alpha.-methylene-2-carboxylic acid, is described. The preparation of intermediates, such as, 6-chloro-.alpha.-hydroxy-.alpha.-methylcarbazole-2-acetic acid and lower alkyl carbazole-2-oxalate, inter alia, is also described.
本文描述了从6-氯-α-羟基-α-甲基咔唑-2-乙酸和/或6-氯-α-亚甲基-2-羧酸制备6-氯-α-甲基咔唑-2-乙酸的过程。同时还描述了中间体的制备,例如6-氯-α-羟基-α-甲基咔唑-2-乙酸和较低的烷基咔唑-2-草酸酯等。