Process for the Preparation of 2-[N-[{S)-1-Ethoxycarbonyl-3-Phenylpropyl]-(S)-Alanyl]-(1S,3S,5S)-2-Azabicyclo[3.3.0]Oct- an-3-Carboxylic Acid
申请人:Bankowski Krzysztof
公开号:US20080234493A1
公开(公告)日:2008-09-25
A process for preparation of 2-[N-[(S)-1-ethoxycarbonyl-3-phenylpropyl]-(S)-alanyl]-(1S,3S,5S)-2- azabicyclo [3.3.0] octane-3-carboxylic acid, ie. Ramipril, involves condensation of an activated derivative of 2-[N-](S)-1-ethoxycarbonyl-3-phenylpropyl]-(S)-alanine with racemic (1R*,3R*,5R*)-2-azabicyclo[3.3.0]octane-3-carboxylic acid, and then the desired diastereoisomer (1a) is separated from the obtained diastereoisomeric mixture of 2-[N-[(S)-1-ethoxycarbonyl-3-phenylpropyl](S)-alanyl]-(1S,3S,5S)-2-azabicyclo[3.3.0]octane-3-carboxylic acid (1a) and 2-[N-[(S)-1-ethoxycarbonyl-3-phenylpropyl -alanyl]-(1R,3R,5R)-2-azabicyclo[3.3.0]octane-3-carboxylic acid (1b) by treating it with a solvent that selectively dissolves the undesired diastereoisomer (1b) while the diastereoisomer (1a) remains undissolved.