Scheme 2.
Synthetic route to 1,2,4-triazole based Mannich bases (19a–30a). Reagents and conditions: (a) morpholine, HCHO, EtOH, 1 h, r.t.; (b) 1-phenylpiperazine, HCHO, EtOH, 1 h, r.t.; (c) 1-(4-fluorophenyl)piperazine, HCHO, EtOH, 1 h, r.t.
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