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.

中文翻译：

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新的吡啶并[4,3-e] [1,2,4]三唑-[5,1-c] [1,2,4]三嗪-6（7 H）-ones的合成

3-取代的1,2,4-三唑-5-重氮盐与乙酰乙酸乙酯的偶联得到1,2,4-三唑-5-基azo，其与二甲基甲酰胺二甲基乙缩醛的反应导致形成相应的易于分离的4- [2-（二甲基氨基）-乙烯基] [1,2,4]三唑并[5,1- c ] [1,2,4]三嗪-3-羧酸盐。新的吡啶并[4,3- e ] [1,2,4]三唑并[5,1- c ] [1,2,4]三嗪-6（7 H）-是通过吡嗪与伯的缩合反应合成的。胺类。