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Synthetic route of compounds 30–32. Reagents and conditions: (a) N2H4·H2O, EtOH, r.t., 48 h. (b) (E)-ethyl 2-cyano-3-ethoxyacrylate, EtOH, 80 °C, 8 h. (c) i. NaOH, EtOH/H2O, reflux, overnight; ii. 5-chloroisatin, ethyl acetoacetate or methyl cyanoacetate or methyl malonamate, AcOH, 100 °C, 6 h.
