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A PhI(OAc)2-mediated trifluoromethylthiolation/oxidative cyclization of ynamides with the Shen reagent has been established herein, providing a facile access to CF3S-substituted oxazolidine-2,4-diones bearing a quaternary carbon center in 38–85% yields with chemoselectivities of up to 99/1.

Graphical abstract: PhI(OAc)2-mediated trifluoromethylthiolation/oxidative cyclization of ynamides

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