Anhydroazasugars as key intermediates in the stereocontrolled preparation of azasugars and their ethyl thioglycosides
作者:José Fuentes、Francisco J. Sayago、José M. Illangua、Consolación Gasch、Manuel Angulo、M. Ángeles Pradera
DOI:10.1016/j.tetasy.2004.01.003
日期:2004.2
Bicyclic azasugar thioglycosides, a new type of azasugar and alkaloid derivative, are stereo selectively prepared from easily available glycosylenamines (D-gluco and L-rhamno configurations), via 1,4-anhydroazasugar derivatives. Polyhydroxylated pyrrolidines (nonreducing pyrrolidine azasugars) are also prepared by reduction with sodium cyanoborohydride of the same 1,4-anhydroazasugars. The stereochemical assignments of the new stereogenic centres are based on NMR experiments, including a study of the interproton distances from quantitative treatment of NOE data and molecular modeling. (C) 2004 Elsevier Ltd. All rights reserved.