Oxygen-containing heterocycles. XVIII. Synthesis and pharmacological activity of oxadiazolobenzodioxanes
作者:A. S. Avakyan、S. O. Vartanyan、É. A. Markaryan、O. M. Martirosyan、O. M. Avakyan
DOI:10.1007/bf00763375
日期:1988.6
An accepted method of synthesis of oxadiazoles is the reaction of hydrazides of the corresponding acids with orthoformic ester [i]. However, as a result of the condensation of the latter with 1,4,benzodioxane-2-carboxylic acid hydrazide (II) at 70-80~ a mixture of two compounds is formed, as has been confirmed chromatographically. The presence in the mass spectrum of the mixture of a molecular peak
一种公认的恶二唑合成方法是相应酸的酰肼与原甲酸酯 [i] 的反应。然而,由于后者与 1,4, 苯并二恶烷-2-羧酸酰肼 (II) 在 70-80° 缩合,形成了两种化合物的混合物,这已通过色谱法证实。质谱中存在 m/z 250 的分子峰的混合物,以及~谱数据表明该混合物由具有线性 (IV) 和环状 (III) 结构的乙氧基衍生物组成,它们是中间产物环化反应。在较高温度(100-110℃)下进行这种缩合会立即形成所需的最终产物 (V),其结构已通过物理化学方法得到证实。