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Reagents and conditions: (a) R3-X (10), CS2, NH2NH2·H2O, KOH, EtOH, rt, 1–3 h; 12, rt, 3 h (60–80%); (b) CS2, DMF, reflux, 6 h 80–90%); (c) R3-X (10), KOH, acetone, H2O, rt, 1 h (60–80%).
