Spiroorthoesterification de sucres C-1 gem dihalogenes
作者:J.P. Praly、L. Brard、G. Descotes
DOI:10.1016/0040-4039(88)85250-x
日期:——
Treatment of the recently described 1-bromo- 2.3,4,6-tetra--acetyl- β -D-glucopyranosyl chloride with silver triflate in the presence of various alcohols allows efficient orthoesterification at the anomeric centre.
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.