New Glycosylation Reaction Based on Alkyne-Co2(CO)6 Complex.

Abstract O -Protected glycopyranoside possessing 4-( O -protected-glucosyl)-6-phenyl-5-hexynoate residue at anomeric position was converted into the corresponding cobalt complex, which on exposure to trimethylsilyl trifluoromethanesulfonate afforded glucosylglucoside derivative in a good yield via internal delivery of glycosyl acceptor. Similar O -protected galactopyranoside and mannopyranoside derivatives provided the corresponding galactosylglucoside and mannosylglucoside derivative, respectively.