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Synthesis of starting materials 1–5a–c. Reagents and conditions: (A) 33%KOH, 96% EtOH, reflux 12h. (B) Absolute EtOH, conc H2SO4, reflux 12 h. (C) NH2NH2.H2O, EtOH, reflux 7 h. (D) HCHO,appropriate secondary amine, EtOH , reflux 5 h. (E) 30% KOH, EtOH, stirring room temperature, 2 h.
