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