Reactivity of per-O-acetylated 1-thioglycosides and glycosyl sulfones towards chromium(II) complexes in aqueous medium
摘要:
Anomeric carbon-sulfur bonds in 1-thioglycosides and glycosyl sulfones can be cleaved by chromium(II) complexes in water-DMF medium. Anomeric radicals as well as sugar-chromium(III) complex intermediates can be generated in these reactions, leading in some cases, to the exclusive formation of the corresponding glycals. (c) 2006 Elsevier Ltd. All rights reserved.
Application of HOF·CH3CN to the synthesis of glycosyl sulfones
摘要:
A fast, complete and clean conversion of thioglycosides into glycosyl sull'ones under mild acidic conditions is described, using the HOF center dot CH3CN complex at room temperature. This methodology affords glycosyl sull'ones in high yields and in excellent purity. (c) 2008 Elsevier Ltd. All rights reserved,