Formation, structure and heterocyclization of aminoguanidine and ethyl acetoacetate condensation products
作者:A. V. Erkin、V. I. Krutikov
DOI:10.1134/s1070363209060309
日期:2009.6
Condensation of aminoguanidine hydrochloride and ethyl acetoacetate results in 2,3-diamino-6-methylpyrimidin-4(3H)-one, 5-hydroxy-1-carboxamidino-3-methylpyrazole or ethyl N-[(5-hydroxy-3-methylpyrazol-1-yl)imidoyl]aminocrotonoate depending on the type of the base. Formation of pyrazole derivatives occurs in the case of dequaternized substrate imine-group protonating by the acids formed as a result
氨基胍盐酸盐和乙酰乙酸乙酯的缩合产生2,3-二氨基-6-甲基嘧啶-4(3 H)-1、5-羟基-1-羧酰胺基-3-甲基吡唑或乙基N -[(5-羟基-3-吡唑-1-基)亚氨基]氨基巴豆酸酯取决于碱基的类型。在通过离子交换反应形成的酸使底物亚胺基脱季铵化的情况下,会形成吡唑衍生物。mid基羟基吡唑结构的螯合物片段提供了该化合物的稳定性,并规定了其惰性以保护杂环封闭。