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Reagents and conditions: (a)536 NaOH, EtOH/H2O, reflux, 3 h; (b) polyphosphoric acid, 180 °C, 4 h; (c) BH3·THF, THF, reflux, 4 h; (d) Pd(OAc)2, PCy3·HBF4, K2CO3, DMA, 170 °C, 48 h; (e) Na2Cr2O7, AcOH, reflux, 1 h; (f)537 Br2, DCM, rt, 48 h; (g) Pd(OAc)2, PCy3·HBF4, K2CO3, DMA, 130 °C, 24 h; (h) DDQ, DCM/dioxane/H2O, 0 °C to rt, 16 h.
