-CFBnSeCFBr was developed as a bromodifluoromethylselenonating reagent, which was utilized by combining with CPBA and TfO for the synthesis of 4-(bromodifluoromethylseleno) isocoumarins via the selenolation/lactonization of 2-alkynylbenzoates. The transformation was postulated to proceed via a multicomponent reagents system-enabled sequence involving the oxidation of -CFBnSeCFBr by CPBA into its selenium sulfoxide, activation of the generated sulfoxide by TfO into the electrophilic -CFBnSeOCFBr salt, and selenolation/lactonization of 2-alkynylbenzoates by the reactive electrophilic species into 4-(bromodifluoromethylseleno) isocoumarins.
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