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