The specification discloses a process for the preparation of Carprofen comprising converting diethyl 2-(6-chloro-2,3,4,9-tetrahydro-1H-carbazol-2-yl)-2-methylmalonate of Formula (II) to diethyl 2-(6-chloro-9H-carbazol-2-yl)-2-methylmalonate of Formula (III) in the presence of a copper salt and converting the compound of Formula (III) to Carprofen.
Process of making 6-chloro-.alpha.-methyl-carbazole-2-acetic acid
申请人:Hoffmann-La Roche Inc.
公开号:US04264500A1
公开(公告)日:1981-04-28
The aromatization of (6-chloro-1,2,3,4-tetrahydro-2-carbazolyl)-methyl-malonic acid dialkyl ester, utilizing chlorine and subsequent conversion of the resulting product to 6-chloro-.alpha.-methyl-carbazole-2-acetic acid by hydrolysis and decarboxylation are described.
A process for the preparation of .alpha.-methyl-carbazole-2-acetic acids, which comprises reacting an .alpha.-methyl-3-oxocyclohexane malonic acid di-lower alkyl ester with a substituted phenylhydrazine, and thereafter sequentially oxidizing and hydrolyzing the reaction product to obtain the desired acid, is described.
A process for the preparation of .alpha.-methyl-carbazole-2-acetic acids, which comprises reacting an .alpha.-methyl-3-oxocyclohexane malonic acid di-lower alkyl ester with a substituted phenylhydrazine, and thereafter sequentially oxidizing and hydrolyzing the reaction product to obtain the desired acid, is described.