Catalytic and stereoselective glycosylation with disarmed glycosyl fluoride having phthaloyl or dichlorophthaloyl protected amino function using a 1:2 combination of stannic chloride and silver tetrakis(pentafluorophenyl)borate

A catalytic and stereoselective glycosylation of various glycosyl accepters with disarmed glycosyl fluorides having phthaloyl or dichlorophthaloyl protected amino function is successfully carried out by using a combination of stannic chloride (SnCl4) and silver tetrakis(pentafluorophenyl)borate [AgB(C6F5)(4)] in the coexistence of MS 5A, and the corresponding 1,2-trans disaccharides are obtained in high yields.