Devasia, Ganapathiplackal M.; Shafi, P. Mohamed, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1980, vol. 19, # 1, p. 70 - 72
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.
pyrrolidine-catalyzed three-component reaction of azlactone, N,O-acetal and alcohol for the synthesis of α,β-diamino ester was reported. The N,O-acetal served as the imine equivalent to occur Mannich reaction with azlactone, and the in situ generated α-functionalized azlactone subsequently underwent a ring-opening process in the presence of alcohol. A series of α,β-diamino esters were obtained in 36–99% yields