申请人:Hoffmann-La Roche Inc.
公开号:US04146542A1
公开(公告)日:1979-03-27
A process for preparing 6-chloro-.alpha.-methylcarbazole-2-acetic acid and esters thereof by the steps of: (a) reacting 6-chloro-1,2,3,4-tetrahydrocarbazole-2-one with a trialkyl-.alpha.-methylphosphonoacetate to yield the corresponding 3,4-dihydro-.alpha.-methylcarbazole-2-acetic acid ester; and (b) aromatizing the reaction product of step (a), prior to or after saponification, to yield, respectively, 6-chloro-.alpha.-methylcarbazole-2-acetic acid or ester, is described. Additionally, there are described 6-chloro-1,2,3,4-tetrahydrocarbazole-2-one useful as an intermediate, and dihydrocarbazoles useful as intermediates and/or as anti-inflammatory and antirheumatic agents.
本发明提供了一种制备6-氯-α-甲基咔唑-2-乙酸及其酯的方法,包括以下步骤:(a)将6-氯-1,2,3,4-四氢咔唑-2-酮与三烷基-α-甲基膦酸乙酯反应,得到相应的3,4-二氢-α-甲基咔唑-2-乙酸酯;(b)在皂化前或皂化后芳香化步骤(a)的反应产物,得到分别的6-氯-α-甲基咔唑-2-乙酸或酯。此外,本发明还提供了6-氯-1,2,3,4-四氢咔唑-2-酮作为中间体,以及作为中间体和/或抗炎和抗风湿剂的二氢咔唑。