Asymmetric synthesis of 1,3- and 1,3,4-substituted pyrrolidines
摘要:
Diastereoselective alkylation of N-acylnorbornene sultams 2 afforded a variety of enantiomerically pure products 3a-3e. Reduction with LiAlH4 (LAH) followed by ditosylation furnished chiral 1,4-ditosylates 5a-5e which underwent a cyclization reaction with primary amines to afford chiral 1,3- and 1,3;4-substituted pyrrolidines. (C) 2000 Elsevier Science Ltd. All rights reserved.
Asymmetric alkylation mediated by tricyclic chiral sultam auxiliaries
作者:Jing Lin、Wing Hong Chan、Albert W.M. Lee、Wai Yeung Wong
DOI:10.1016/s0040-4020(99)00872-8
日期:1999.12
The use of enantiomerically pure sultams (+)-1 and (−)-1 as practical chiralauxiliaries for asymmetric alkylation reactions is described in full. Deprotonation of the N-acylated products derivedfrom the auxiliaries with sodium hexamethyldisilazide followed by treatment with alkyl halides gave products with high diastereoselectivity. On treatment with excess racemic α-bromopropanoate or α-bromobutanoate
Asymmetric synthesis of 1,3- and 1,3,4-substituted pyrrolidines
作者:Jing Lin、Wing Hong Chan、Albert W.M Lee、Wai Yeung Wong、Pei Qiang Huang
DOI:10.1016/s0040-4039(00)00278-1
日期:2000.4
Diastereoselective alkylation of N-acylnorbornene sultams 2 afforded a variety of enantiomerically pure products 3a-3e. Reduction with LiAlH4 (LAH) followed by ditosylation furnished chiral 1,4-ditosylates 5a-5e which underwent a cyclization reaction with primary amines to afford chiral 1,3- and 1,3;4-substituted pyrrolidines. (C) 2000 Elsevier Science Ltd. All rights reserved.