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Reagents and conditions: (a)92 CuI, K2CO3, 18-crown-6, o-dichlorobenzene, 180 °C, 48 h; Pd(OAc)2, PCy3·HBF4, K2CO3, DMA, 170 °C, 48 h; (c) 30% H2O2, AcOH, CHCl3, 60 °C, 12 h; (d) AgSbF6 (1 or 2 equiv), dry DCM, rt, 20 min.
