Stereoselective copper-catalyzed Chan-Lam-Evans N-arylation of glucosamines with arylboronic acids at room temperature

An efficient and practical N-arylation of glycosylamines with substituted aryl boronic acids has been established. Using Cu(OAc)(2) and pyridine at room temperature under air atmosphere, the protocol proved to be general, and a variety of aryl N-glycosides have been prepared in good to excellent yields with exclusive beta selectivity.