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