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Reagents and conditions: (a)608 pyridine, reflux, 48 h; (b) BBr3, DCM; (c) Me(OCH2CH2)4OMs or Me(OCH2CH2)12OMs, Cs2CO3, DMF, 90 °C; (d) (1) Zn(OAc)2·2H2O, DCM/MeOH, (2) 324.3 (1 equiv), Na2CO3, copper(I) thiophene-2-carboxylate, CH3CN, 50 °C, (3) HCl.
