Phosphomolybdic acid supported on silica gel: a mild, efficient and reusable catalyst for the synthesis of 2,3-unsaturated glycopyranosides by Ferrier rearrangement

A simple, mild, efficient and environmentally benign method for the synthesis of 2,3-unsaturated allyl C-glycosides and O- and S-glycosides is described using phosphomolybdic acid supported on silica gel as a reusable catalyst with high α-selectivity.