H2SO4-SiO2: Highly efficient and novel catalyst for the Ferrier-type glycosylation

Sulfuric acid immobilized on silica gel is designed as a very useful catalyst for synthesis of 2,3-unsaturated glycopyranosides.This handy,metal-free,environment friendly transformation provides high yields and α-stereoselectivities in a very few amount (＜0.02 eq.＝ of catalyst and in short reaction times (＜10 min).