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Reagents and conditions: (i) DMF-DMA, reflux, 1 h; (ii) SO2NH2–C6H4–NHNH2·HCl, EtOH, reflux, 2 h; (iii) NH2NH2·H2O 95%, reflux 3 h; (iv) NaNO2, AcOH, 0–5 °C, 45 min; (v) toluene, reflux 1 h; (vi) R1–C6H4–NH2, toluene, reflux 2 h.
