Synthesis and Diels–Alder reactions of α,β-unsaturated-γ-sultams
作者:K.F Ho、Dennis C.W Fung、W.Y Wong、W.H Chan、Albert W.M Lee
DOI:10.1016/s0040-4039(01)00313-6
日期:2001.4
An efficient synthesis of prop-1-ene 1,3-sultam 4 and its Diels-Alder reactions is reported. Sultams are also prepared as chiral auxiliaries for asymmetric transformations. (C) 2001 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