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Reagents and conditions: (i) Et3N, CH2Cl2, room temperature, overnight; (ii) DME/EtOH/H2O (1:1:1), Cs2CO3, Pd(PPh3)4, microwave irradiation (150°C, 150W, 20 min); (iii) BF3·SMe2, CH2Cl2, room temperature, overnight.
