Photolysis of sugar anomeric diazides: Sugar-derived tetrazoles as evidences for a major nitrene decomposition pathway
作者:Jean-Pierre Praly、Carméla Di Stéfano、Gérard Descotes、René Faure
DOI:10.1016/0040-4039(94)88169-3
日期:1994.1
preponderance of regioisomeric sugar-derived tetrazoles (up to 75% total yield) obtained upon photolysis of protected (benzyl, acetyl) glucopyranosylidenediazides, even in the presence of added acrylonitrile, proved that azidonitrene intermediates predominate over anomeric carbenes, in the reaction. Revisions are presented for its mechanism and one structure.
Syntheses of anomeric glucopyranosylidene diazides
作者:J.-P. Praly、Z. El Kharraf、G. Descotes
DOI:10.1039/c39900000431
日期:——
Protected glucopyranosylidenediazides have been obtained in good yields by two routes which involve nucleophilic substitutions at the anomeric polsition of either 2,3,4,6-tetra-O-acetyl-1-bromo-β-D-glucopyranosyl chloride or 2,3,4,6-tetra-O-benzyl-D-glucono-1,5-lactone, in the presence of silver azide or trimethylsilyl azide, respectively.
Synthesis of C-1 spirocyclopropyl sugars from anomeric diazides.
作者:J.-P. Praly、Z. El Kharraf、G. Descotes
DOI:10.1016/s0040-4039(00)97642-1
日期:1990.1
The photolysis of peracetylated glucopyranosylidenediazide in the presence of acrylonitrile in excess yields four C-1 spirocyclopropyl sugars in a 65% combined yield. This unprecedented synthesis of bis C,C-glycosides is supposed to inlvolve anomeric carbene intermediates.