Enantioselective hydrogenation of some alpha,beta -unsaturated nitriles and their corresponding methyl esters bearing a phthalimidomethyl substituent at the alpha -carbon using Rh-DuPHOS catalysts afforded beta -amino acid precursors with modest e.e.s of up to 48%. Hydrogenation of the alpha,beta -unsaturated methyl esters using a Ru-BINAP catalyst gave higher e.e.s of up to 84%. Method development for the determination of the enantiomeric excesses of these derivatives using chiral HPLC is also reported. (C) 2001 Elsevier Science Ltd. All rights reserved.
作者:Dilek Saylik、Eva M. Campi、Andrew C. Donohue、W.Roy Jackson、Andrea J. Robinson
DOI:10.1016/s0957-4166(01)00097-0
日期:2001.3
Enantioselective hydrogenation of some alpha,beta -unsaturated nitriles and their corresponding methyl esters bearing a phthalimidomethyl substituent at the alpha -carbon using Rh-DuPHOS catalysts afforded beta -amino acid precursors with modest e.e.s of up to 48%. Hydrogenation of the alpha,beta -unsaturated methyl esters using a Ru-BINAP catalyst gave higher e.e.s of up to 84%. Method development for the determination of the enantiomeric excesses of these derivatives using chiral HPLC is also reported. (C) 2001 Elsevier Science Ltd. All rights reserved.
[EN] PROCESS FOR THE PREPARATION OF 1,2-DIAMINES<br/>[FR] PROCEDE DE PREPARATION DE 1,2-DIAMINES
申请人:RANBAXY LAB LTD
公开号:WO2005113512A1
公开(公告)日:2005-12-01
The invention relates to processes for the preparation of 1,2-diamines, and to the use of these compounds as intermediates for the preparation of several pharmaceutically active compounds. More particularly, it relates to the preparation of 2-methyl-1,2-diaminopropane. The process involves reductive cyclization of 1, 1 -cyanoanilide followed by hydrolysis of the resultant imidazole derivative to get 1,2-diamine.