Résumé
A series of substituted thiophenyl glycosides and glycosyl phenylsulfones were converted in high yield into glycals after reductive lithiation with lithium naphthalenide, followed by elimination of the substituent at C-2.
An efficient synthesis of pyranoid glycals from thiophenylglycosides or glycosyl phenylsulfones with acid or base labile protecting groups is described.