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Reagents and conditions: (a)644 (1) Pd(PPh3)4, K2CO3, toluene/DMF (1:1, v/v), 110 °C, 36 h, (2) Pd(PPh3)4, triethylamine, formic acid, toluene, 100 °C, 2 h; (b) DDQ, DCM/triflic acid (100:1, v/v), rt, 10 h.
