Using In(III) as a promoter for glycosylation

InCl3, InBr3, and In(OTf)(3) were tested as promoters in the preparation of glycosides from trichloroacetimidate precursors. A range of protecting groups and of alcohol acceptors were used to determine the versatility of these promoters. Disaccharide formation was demonstrated. In most cases, the In(III) compounds were shown to promote glycosylation better than the widely used promoter BF3 center dot OEt2. (C) 2011 Elsevier Ltd. All rights reserved.