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(i) PhI(OC(O)CF3)2 (phenyliodine bis(trifluoroacetate) (PIFA)), CH2Cl2, trifluoroacetic acid (TFA), 0 °C, and 45–81%; (ii) CuBr (20 mol %), DMSO, air, 120 °C, and 56–99%; and (iii) PIFA, dimethylformamide (DMF)–H2O, r.t., and 4 h.
