作者:Olga Yu. Ozerova、Tatiana P. Efimova、Tamara A. Novikova
DOI:10.1007/s10593-020-02649-w
日期:2020.2
The reactions of 1-amino-2-nitroguanidine with α-ketocarboxylic acids gave substituted hydrazones of α-ketocarboxylic acids, the cyclization of which depended on the geometry of the azomethine moiety. It was established that the obtained hydrazones were able to form a 1,2,4-triazine system in the case when the hydrazone of its linear precursor existed in the form of Z(syn)-isomer. Thus, the phenylglyoxalic
1-氨基-2-硝基胍与α-酮羧酸的反应得到α-酮羧酸的取代,其环化取决于偶氮甲碱部分的几何形状。已经确定,当其线性前体的以Z(syn)-异构体形式存在时,所获得的能够形成1,2,4-三嗪系统。因此,其偶氮甲碱部分以Z型形式存在的苯乙二醛酸经历了杂环化反应,形成了取代的3-硝基亚氨基-6-苯基-4,5-二氢-1,2,4-三嗪-5( 2 Н) -酮,而乙醛酸和methylglyoxalic酸腙,其在存在ë-配置,未参与此反应。