The crucial role of the nitrogen substituent in the desymmetrisation of cyclic meso-imides using B-Me and B-OMe oxazaborolidine catalysts
摘要:
Various cyclic meso-imides have been desymmetrised via enantioselective reduction using two chiral oxazaborolidine catalysts derived from (1R,2S)-cis-1-amino-indan-2-ol followed by the reduction of the hydroxylactarn product to give the gamma-lactam. The enantiomeric excesses were shown to be 27-99% by chiral HPLC and chiral GC of the gamma-lactam products with the nitrogen substituent playing a pivotal role in determining yield and selectivity. (c) 2006 Elsevier Ltd. All rights reserved.