Process for producing optically active halohydrin compound
申请人:——
公开号:US20040082820A1
公开(公告)日:2004-04-29
A process of preparing an optically active halohydrin compound characterized by comprising asymmetric hydrogen transfer reduction of an &agr;-haloketone compound in the presence of a group 9 transition metal compound having a substituted or unsubstituted cyclopentadienyl group and an optically active diamine compound. The asymmetric hydrogen transfer reduction is preferably conducted in the presence of a base.
PROCESS FOR PRODUCING OPTICALLY ACTIVE HALOHYDRIN COMPOUND
申请人:Ajinomoto Co., Inc.
公开号:EP1346972A1
公开(公告)日:2003-09-24
A process of preparing an optically active halohydrin compound characterized by comprising asymmetric hydrogen transfer reduction of an α-haloketone compound in the presence of a group 9 transition metal compound having a substituted or unsubstituted cyclopentadienyl group and an optically active diamine compound. The asymmetric hydrogen transfer reduction is preferably conducted in the presence of a base.
Asymmetric transfer hydrogenation of N-substituted (3S)-3-amino-1-chloro-4-phenyl-2-butanones in the presence of Cp*RhCl[(R,R)-Tsdpen] (SIC = 1000) with a mixture of formic acid/triethylamine gave N-substituted (2R,3S)-3-amino-1-chloro-2-hydroxy-4-phenylbutanes with up to 93% de in a quantitative yield, and reduction with the enantiomeric catalyst Cp*RhCl[(S,S)-Tsdpen] gave (2S,3S)diastereomeric alcohol with up to 96% de.