acetonitrile (350 mL). The solution was stirred for 3 days at room temperature. The solvent was evaporated and the residue was dissolved in a minimum amount of CHC1, and chromatographed on a silica gel column [eluent, acetone-CHC1,(1: 9)]. The fractions containing the glycosylation product were pooled, evaporated to dryness, and treated with MeOH (400 mL), presaturated with NH3 at 0" C. The solution was stored in a pressure ...
