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General synthesis of compounds 4a–m. Reagents and conditions: (a) H2O, ethanol, 60 °C; (b) N,N-Dimethylformamide(DMF), POCl3, 90 °C, 5h; (c) KMnO4, 70–80 °C; (d) HCl, 135 °C, H2SO4, 90 °C; (e) Dicyclohexylcarbodiimide(DCC), 4-dimethylaminopyridine(DMAP), DMF, rt.
