Iodosobenzene-triflic anhydride as an efficient promoter for glycosidation reaction using thioglycosides as donors
摘要:
A reagent prepared in situ from iodosobenzene (PhIO) and trifluoromethanesulfonic anhydride (Tf2O) was successfully applied to the activation of thioglycosides. Glycosidation with benzyl-protected methyl thioglycosides as glycosyl donors proceeded smoothly under mild reaction conditions. The same reagent also promoted glycosidation with less reactive acylated methyl thioglycosides in the presence of silica gel to form 1, 2-trans glycosides.