ENANTIOSELECTIVE PROCESS FOR CYCLOALKENYL ?-SUBSTITUTED ALANINES
申请人:Liu Zijun
公开号:US20110257408A1
公开(公告)日:2011-10-20
A process for preparing an enantiomerically enriched cycloalkene-substituted alanine compound having the structure:
by asymmetrically hydrogenating a dehydro amino acid compound having the structure:
in a suitable reaction media in the presence of a catalyst having a transition metal moiety complexed to a chiral phosphine ligand to prepare enantiomerically enriched cycloalkene substituted alanine compounds having the structure of Formula (IA) or (IB), which are key intermediates for the ACE inhibitors ramipril and perindolpril:
The present invention relates to cycloalkanone β-substituted alanine derivatives, a process for the preparation of cycloalkanone β-substituted alanine derivatives and the use of cycloalkanone β-substituted alanine derivatives in the preparation of enantiomerically enriched α-amino acids. Furthermore, the present invention relates to the preparation of pharmaceutically active products such as perindopril and ramipril using the novel cycloalkanone β-substituted alanine derivatives.
[EN] NOVEL CARBAMOYLGLYCINE DERIVATIVES<br/>[FR] NOUVEAUX DÉRIVÉS DE CARBAMOYLGLYCINE
申请人:DSM IP ASSETS BV
公开号:WO2009050041A1
公开(公告)日:2009-04-23
The present invention relates to carbamoylglycine derivatives, a process for the preparation of carbamoylglycine derivatives and the use of carbamoylglycine derivatives in the preparation of enantiomerically enriched α-amino acids. Furthermore, the present invention relates to the preparation of pharmaceutically active products such as perindopril and ramipril using the novel carbamoylglycine derivatives.
[EN] IMPROVED RAMIPRIL SYNTHESIS<br/>[FR] SYNTHÈSE AMÉLIORÉE DU RAMIPRIL
申请人:DSM IP ASSETS BV
公开号:WO2009062999A1
公开(公告)日:2009-05-22
The present invention relates to the preparation of ramipril (formula [1]) from unprotected (2S,3S,6S)-octahydrocyclopenta[b]pyrrole-2-carboxylic acid and to a method for preparing unprotected (2S,3S,6S)-octahydrocyclopenta[b]pyrrole-2- carboxylic acid.