Process for the preparation of enantiomerically enriched indoline-2-carboxylic acid
申请人:DSM IP Assets B.V.
公开号:EP1676838A1
公开(公告)日:2006-07-05
The present invention relates to a process for the preparation of an enantiomerically enriched optionally substituted indoline-2-carboxylic acid or a salt thereof, said process comprising subjecting an enantiomerically enriched chiral 2-amino-3-(2-X-substituted aryl)-propionic acid or 2-yl-substituted-amino -3-(2-X-substituted aryl)-propionic acid or a salt thereof, wherein X is a leaving group, to cyclisation, preferably at a temperature of below about 140°C, and in case of the yl-substituted compound, removing said yl-substituent by hydrolysis either prior to or after said cyclisation.
Process for the Preparation of Enantiomerically Enriched Indoline-2-Carboxylic Acid
申请人:De Vries Andreas Hendrikus Maria
公开号:US20090043112A1
公开(公告)日:2009-02-12
The present invention relates to a process for the preparation of an enantiomerically enriched optionally substituted indoline-2-carboxylic acid or a salt thereof, wherein an enantiomerically enriched chiral ortho-X-substituted phenylalanine compound, wherein X is a leaving group, is subjected to cyclisation, preferably at a temperature of below about 140° C., upon formation of the enantiomerically enriched indoline-2-carboxylic acid compound.
Asymmetric synthesis catalyzed by transition metal complexes with rigid chiral ligands
申请人:The Penn State Research Foundation
公开号:US20010047113A1
公开(公告)日:2001-11-29
This invention is to develop novel transition metal catalysts for the practical synthesis of important chiral molecules. The invention emphasizes asymmetric catalysis based on chiral bidentate phosphine ligands with cyclic ring structures which could be used to restrict conformational flexibility of the ligands and thus the efficiency of chiral transfer can be enhanced through the ligand rigidity.
Axial 4,4′,6,6′-Tetrakis-trifluoromethyl-biphenyl-2,2′-diamine (TF-BIPHAM): Resolution and Applications in Asymmetric Hydrogenation
作者:Chun-Jiang Wang、Feng Gao、Gang Liang
DOI:10.1021/ol8018677
日期:2008.11.6
The racemic TF-BIPHAM was resolved for the first time, and the effectiveness of the resolved diamine was demonstrated by highly enantioselective hydrogenation of alpha-aryl enamides and (x-dehydroamino acid esters using readily accessible bis(aminophosphine) ligands.
Magnesium-methanol as a simple convenient reducing agent for α,β -unsaturated esters