Alkoxyamino derivatives of oligosaccharides have been synthesized by enzymatic synthesis using a glycosynthase and a transglycosidase. The chemoselective assembly of unprotected oligosaccharides bearing glucose at the reducing end with N-alkyl-O- benzylhydroxylamine provides sugar derivatives that are good acceptors for enzymatic synthesis using either glycosynthase or transglycosidase. Furthermore, this method ...