Ferrier Rearrangement Catalyzed by HClO 4 -SiO 2 : Synthesis of 2,3-Unsaturated Glycopyranosides

Alkyl 2,3-unsaturated glycopyranosides have been prepared by the Ferrier rearrangement of acetyl protected glycals catalyzed by HClO 4 -SiO 2 . Operational simplicity, use of economically convenient catalyst, mild reaction conditions, high yields, short reaction times are the key features of this protocol.