Coupling of 3-substituted 1,2,4-triazole-5-diazonium salts with ethyl acetoacetate afforded 1,2,4-triazol-5-ylhydrazones, the reaction of which with dimethylformamide dimethyl acetal leads to the formation of the corresponding readily separable 4-[2-(dimethylamino)-vinyl][1,2,4]triazolo[5,1-c][1,2,4]triazine-3-carboxylates. New pyrido[4,3-e][1,2,4]triazolo[5,1-c][1,2,4]triazin-6(7H)-ones were synthesized by the condensation of the latter with primary amines.
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The study was supported by a grant from the Russian Science Foundation (project no. 18-74-10097).
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2020, 56(10), 1348–1352
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Mawlood, M.N., Potapov, M.A., Ledenyova, I.V. et al. Synthesis of new pyrido[4,3-e][1,2,4]triazolo-[5,1-c][1,2,4]triazin-6(7H)-ones. Chem Heterocycl Comp 56, 1348–1352 (2020). https://doi.org/10.1007/s10593-020-02821-2
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DOI: https://doi.org/10.1007/s10593-020-02821-2