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Reagents and conditions: (a) CH3COONa, CH3COOH, reflux, 24 h; (b) CH3ONa, CuBr, 80 °C, 24 h; (c) TBTU, DIPEA, DCM, rt, overnight; (d) DMSO, 10% NaOH, rt, 6 h; (e) CH3COOH, reflux, 12 h; (f) SnCl2·2H2O, CH3OH; (g) K2CO3, DMF, alkyl halide, rt, 4 h; (h) SnCl2·2H2O, CH3OH.
