and cycloaddition of azide anion to the resulting C-2 double bond. Transformation of the new fused heterocyclic iminophosphoranes on treatment with aqueous ethanolic ammonia gives carboxamidine derivatives of ν-triazole bearing a chiral trihydroxypropyl side-chain. Crystal structure of 5-( d -erythro-1′,2′,3′-trihydroxypropyl)-1,2,3-triazole-4-carboxamidine was established by X-ray crystallography
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.
Some sugar tetrazoles have been synthesized by the photolysis or the thermolysis of d-glucopyranosylidene diazide of d-galactopyranosylidene diazide. The reaction mechanism is discussed.