METHOD FOR THE PREPARATION OF TRICYCLIC AMINO ALCOHOL DERIVATIVES THROUGH AZIDES
申请人:Asahi Kasei Kabushiki Kaisha
公开号:EP1174426A1
公开(公告)日:2002-01-23
The present invention is directed to processes for the preparation of a tricyclic amino-alcohol derivative useful for treating and preventing diabetes, obesity, hyperlipidemia and the like, which compound is represented by the formula (1):
wherein R1 represents a lower alkyl group or a benzyl group; *1 represents an asymmetric carbon atom; R2 represents a hydrogen atom, a halogen atom or a hydroxyl group; and A represents one of the following groups:
wherein X represents NH, O or S; R5 represents a hydrogen atom, a hydroxyl group, an amino group or an acetylamino group; and *2 represents an asymmetric carbon atom when R5 is not a hydrogen atom. The processes of the present invention proceed via azide derivatives and are convenient, practical preparing processes with low cost which comprise a small number of steps with good industrial work efficiency.
Ir(III) complexes of diamine ligands for asymmetric ketone hydrogenation
作者:José E.D. Martins、Martin Wills
DOI:10.1016/j.tet.2009.05.012
日期:2009.7
The use of a combination of IrCl3 with a series of ligands derived from the C2-symmetric diamine di-phenylethanediamine (DPEN) forms a catalyst capable of the asymmetric hydrogenation of ketones in up to 85% ee. (C) 2009 Elsevier Ltd. All rights reserved.