[EN] SYNTHESIS OF (2-AMINO)-TETRAHYDROCARBAZOLE-PROPANOIC ACID<br/>[FR] SYNTHÈSE D'ACIDE (2-AMINO)-TÉTRAHYDROCARBAZOLE-PROPANOÏQUE
申请人:CHIRAL QUEST INC
公开号:WO2010078250A1
公开(公告)日:2010-07-08
The present invention provides a new approach to the synthesis of 2-amino-tetrahydrocarbazole-propanoic acid, a key intermediate for the synthesis of Ramatroban. More specifically, a synthesis of 2-amino-tetrahydrocarbazole- propanoic acid which includes oxidizing an aminocyclohexanol to form an aminocyclohexanone, condensing the aminocyclohexanone to form a tetrahydrocarbazole, deprotecting the tetrahydrocarbazole to yield a racemic mixture of a tetrahydrocarbazole, resolving the racemic mixture to obtain a yield mixture with an enantiomeric excess of one enantiomer over another, alkylating the excess enantiomer to yield an alkyl ester, and hydrolyzing the alkyl ester to yield 2-amino-tetrahydrocarbazole-propanoic acid.