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Reagents and conditions: (i) thiosemicarbazide, EtOH, HCl, reflux, 1 h. (ii) NH4Fe(SO4)2.12H2O, H2O, reflux, 16 h. (iii) NaNO2, HCl, Cu, 0 C! rt, 3 h. (iv) piperazine, EtOH, reflux, 1 h (v) benzoyl chloride, 3-nitro benzoyl chloride, 4-nitro benzoyl chloride, 4-methoxy benzoyl chloride, 4-methyl benzoyl chloride, pyridine, EtOH, rt , 24 h
