Environmentally compatible C-glycosidation of glycals using montmorillonite K-10

Abstract

The C-glycosidations of glycal acetates 1–4 with allyltrimethylsilane 5, vinyloxytrimethylsilane 6 or isopropenyl acetate 7 using montmorillonite K-10 as an environmentally acceptable and inexpensive industrial catalyst under mild conditions proceed effectively to give the corresponding 2,3-unsaturated C-glycosides in high yields.