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Syntheses of 5. (a) K2CO3, n-butanol, 150 °C by microwave, 7 h. (b) CuSO4, L-ascorbic acid sodium salt, Et3N, Methanol-H2O, rt, overnight. (c) (i) p-CH3C6H4SO2NHNH2, EtOH, rt, 0.5 h; (ii) NaOH, H2O, −5 °C – 0 °C; (iii) NaNO2, H2O, HCl, 3-aminobenzonitrile, −5 °C – 0 °C, 0.5 h.
