A photoinduced vicinal difluoroalkylation and aminosulfonylation of alkynes under photocatalysis was realized. The combination of ethyl 2‐bromo‐2,2‐difluoroacetate, alkynes, and DABCO⋅(SO2)2 with hydrazines, catalyzed by 9‐mes‐10‐methyl acridinium perchlorate in the presence of visible light, afforded (E)‐ethyl 2,2‐difluoro‐4‐aryl‐4‐sulfamoylbut‐3‐enoates in good yields with high stereoselectivity. This four‐component reaction proceeds through radical addition with the insertion of sulfur dioxide.
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Xiang et al. (2016) studied this question.
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