Halide Effects on Cyclopropenium Cation Promoted Glycosylation with Deoxy Sugars: Highly α-Selective Glycosylations Using a 3,3-Dibromo-1,2-diphenylcyclopropene Promoter
作者:Jason M. Nogueira、John Paul Issa、An-Hsiang Adam Chu、Jordan A. Sisel、Ryan S. Schum、Clay S. Bennett
DOI:10.1002/ejoc.201200907
日期:2012.9
A mixture of 3,3-dibromocyclopropene and TBAI promotes highly α-selective glycosylation reactions (up to >20:1) by using deoxy sugar hemiacetal donors. The reaction provides a convenient method for generating highly reactive glycosyl donors in situ from shelf-stable starting materials. Both armed and disarmed sugars undergo the reaction, and selectivity is independent of the configuration of the donor
3,3-二溴环丙烯和 TBAI 的混合物通过使用脱氧糖半缩醛供体促进高度 α 选择性糖基化反应(高达 >20:1)。该反应提供了一种方便的方法,用于从储存稳定的起始材料原位生成高反应性糖基供体。武装和解除武装的糖都会发生反应,选择性与供体糖的构型无关。