Ring contraction of glycopyranosyl enamines: an easy route to furanoid thioglycosides of 5-aminosugars
作者:M.Ángeles Pradera、Francisco J. Sayago、José M. Illangua、Manuel Angulo、Consolación Gasch、José Fuentes
DOI:10.1016/j.tetasy.2004.05.027
日期:2004.7
The reaction of glycohexapyranosyl enamines, having 2- and 3-hydroxyl groups in a cis-relationship with 12-dimethoxypropane, induces ring contraction of the sugar ring with formation of 2,3-O-isopropylidene furanoid glycosylenamines. 5-O-Mesylation of these compounds. followed by formation of anhydroazasugars and nucleophilic ring opening, with thiols, produces alkyl and aryl thiofuranosides of 5-aminosugars. (C) 2004 Elsevier Ltd. All rights reserved.