GLYCOSYL DONORS WITH PHOSPHORIMIDATE LEAVING GROUPS FOR EITHER α- OR β- GLYCOSIDATION
摘要:
Glycosyl N-phenyl diethyl phosphorimidates, readily prepared via the Staudinger reaction of glycosyl diethyl phosphites with phenyl azide, served as efficient glycosyl donors for the formation of either 1,2-cis or 1,2-trans glycosidic bonds under selected reaction conditions. (C) 1997 Elsevier Science Ltd.
2-Deoxy-2-fluoromannosyl phosphotriester and phosphodiester derivatives were synthesized and they were demonstrated to be more stable than the 2-OH compounds under acidic conditions. 2-Fluoro substituted analog of α-mannopyranosyl 1-phosphodiester 20 was found to be significantly stable at pH 1, where 2-OH compound 21 was gradually hydrolyzed. In addition, 2-F analogs of α-mannopyranosyl 1-phosphotriesters