“…Lermontov reported that the reaction of α,α-difluoroazide, namely 2-hydroperfluoropropyl azide, with terminal acetylenes at 90-130 ℃ afforded mixtures of isomeric fluorinated triazoles in high yields via cycloaddition reaction. 7 In 2007, Hosoya 8 synthesized difluoromethylenecontaining 1,2,3-triazoles by the reaction of difluoroazides with phenylacetylene in the presence of CuSO 4 , sodium ascorbate, and the triazole ligand TBTA. In this paper, we report the synthesis of novel gem-difluoromethylene-containing 1,2,3-triazoles by the click reaction of ethyl 2-azido-2,2-difluoroacetate and terminal alkynes in the presence of 10 mol% CuI.…”