Regioselective glycosylation of fully unprotected methyl hexopyranosides by means of transient masking of hydroxy groups with arylboronic acids

One-pot synthesis of α/β (1→2)-, (1→3)-, or (1→4)-linked disaccharides has been developed by regioselective glycosylation of fully unprotected glycosyl acceptors, with application to short step assembly of the trisaccharide fragment of type II arabinogalactan.