Scheme 1.
Reagents and conditions: (a) (i) KOH, C2H5OH, H2O, reflux, (ii) HCl, H2O; (b) SOCl2, reflux; (c) R3NHSO2C6H6NH2-p, pyridine, 25 °C; (d) pyridine, 25 °C; (e) (i) NaOH, H2O, reflux, (ii) HCl.
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