Synthesis of Azidodifluoromethyl Phenyl Sulfone and Its Use as a Synthetic Equivalent of the Azidodifluoromethyl Anion.

Abstract

Azidodifluoromethyl phenyl sulfone, a new stable fluorinated azide, was synthesized on a multi-gram scale from difluoromethyl phenyl sulfone. The synthetic utility of the title azide in the preparation of N-difluoro(phenylsulfonyl)methyl-1,2,3-triazoles was demonstrated on examples of azide-alkyne cycloaddition reactions. Subsequent reductive desulfonylation/silylation afforded N-difluoro(trimethylsilyl)methyl-1,2,3-triazoles, and rhodium(II)-catalyzed transannulation with nitriles provided N-difluoro(phenylsulfonyl)methyl-substituted imidazoles. The title azide thus represents a synthetic equivalent of the azidodifluoromethyl anion.