Copper catalyzed β-difluoroacetylation of dihydropyrans and glycals by means of direct C-H functionalization.
Résumé
A copper catalyzed direct functionalization of dihydropyrans and glycals has been developed. This method affords a new and straightforward access to C-2-CF2 dihydropyrans and glycosides in a single step starting from readily available starting materials. This new copper based catalytic system, probably involving a Cu(III) species as supported by experiments, allows the formation of the valuable fluorinated glycosides in good yields.