[EN] PROCESS FOR STEREOSELECTIVE PREPARATION OF AN INTERMEDIATE OF PROTEASE INHIBITORS<br/>[FR] PROCÉDÉ DE PRÉPARATION STÉRÉOSÉLECTIVE D'UN INTERMÉDIAIRE D'INHIBITEURS DE PROTÉASES
申请人:PIRAMAL HEALTHCARE LTD
公开号:WO2010143150A2
公开(公告)日:2010-12-16
The present invention provides a process for stereoselective preparation of N-[(1S,2R)-2- hydroxy-3-nitro-l-(phenylmethyl)propyl]carbamic acid 1,1-dimethylethyl ester (nitroalcohol) comprising asymmetric reduction of the carbonyl group in [(1S)-3-nitro-2- oxo-1-(phenylmethyl)propyl]carbamic acid 1,1-dimethylethyl ester (nitroketone) using sodium borohydride as the reducing agent in a solvent mixture of an alcohol and a halogenated solvent at a temperature ranging from -15°C to 00C to yield nitroalcohol in > 78 % yield and > 99 % chiral purity.