Wittig reaction of glycosyl phosphonium salts:: a stereoselective route to C-disaccharides and C,O-trisaccharides

C-Disaccharides and C,O-trisaccharides, with a quaternary anomeric center, were prepared in good yields and excellent stereoselectivity by a route involving the Wittig reaction of glycosyl phosphonium salts and hydrogenation or glycosidation of exo-glycals as key steps. (C) 2003 Elsevier Ltd. All rights reserved.