Ferrier rearrangement catalyzed by HClO4-SiO2:: Synthesis of 2,3-unsaturated glycopyranosides

Alkyl 2,3-unsaturated glycopyranosides have been prepared by the Ferrier rearrangement of acetyl protected glycals catalyzed by HClO4-SiO2. Operational simplicity, use of economically convenient catalyst, mild reaction conditions, high yields, short reaction times are the key features of this protocol.