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4-(2-Aminobenzyl)-3-phenyl-4,5-dihydro[1,2,4]triazol-5-one (3) was prepared by catalytic hydrogenation of the corresponding 1-benzoyl-4-(2-nitrobenzyl)semicarbazide (2). The cyclization of 3 in alkaline medium led to the 4-(2-aminobenzyl)-3-phenyl-4,5dihydro[1,2,4]triazol-5-one (4) which was the key intermediate for the synthesis of target bicyclic heterocyclic NH acids. By the diazotation of 4 and coupling of the resulting diazonium salt with ethyl cyanoacetylcarbamate or malonodinitrile, the hydrazones 5a and 5b, respectively, were prepared. These arylhydrazones were then transformed into [1,2,4]triazine (5c) and 1,3diaminopyrazole (5d).

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Polycyclic heterocycles with acidic N-H groups VIII. The synthesis of some binuclear N-H acids with free rotary 1,2,4-triazole, 6-azauracile and pyrazole ring