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Reagents and conditions: (a)511 CuI, K2CO3, 18-crown-6, o-dichlorobenzene, 180 °C, N2, 24 h; (b) (1) NaOH, MeOH, reflux, 10 h, then aq. HCl; (c) DMF (cat.), SOCl2, reflux, 1 h; (d) AlCl3, DCM, rt, 12 h.
