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Reagents and conditions: (a) (i) PdCl2(PPh3)2∙DCM, CuI, THF/TEA 1:3, rt, MW, 30 min, (ii) ACN, 100 °C, MW, 25 min, 72%; (b) (3,5-dimethoxyphenyl)boronic acid, Pd(PPh3)4, DMF/EtOH 1:1, aq 1 M CssCO3, 120 °C, 20 min, MW, 91%; (c) BBr3 1 M DCM, DCM, −78 °C to rt, overnight, 96%.
