Stereoselective Reformatskii–Claisen rearrangement: synthesis of 2′,3′-dideoxy-6′,6′-difluoro-2′-thionucleosides

Abstract

A new approach for the stereoselective synthesis of 2′,3′-dideoxy-6′,6′-difluoro-2′-thionucleosides, analogues of highly bioactive L-OddC and 3TC, has been developed viaTMSCl/pyridine induced stereoselective Reformatskii–Claisen rearrangement of secondary allyl chlorodifluoroacetate and then a regioselective Pummerer reaction to introduce bases.