Introduction of a novel dicationic Brönsted acidic ionic liquid based on pyrazine and its application in the synthesis of xanthenediones and 3, 4-dihydropyrimidin-2(1H)-ones under solvent-free conditions
作者:Seyyed Erfan Sadati Sorkhi、Mohammad M. Hashemi、Ali Ezabadi
DOI:10.1007/s11164-020-04089-9
日期:2020.4
acidic ionic liquid based on pyrazine has been prepared and characterized by FTIR, 1H NMR, 13C NMR, MS, thermal gravimetric and differential thermal gravimetric analysis and also Hammett acidity function. The prepared dicationic ionic liquid is found to be an efficient and reusable catalyst for the synthesis of xanthenediones and 3,4-dihydropyrimidin-2(1H)-ones under solvent-free conditions. The merits
制备了一种新型的吡嗪类布朗斯台德酸性离子液体,并通过FTIR,1 H NMR,13 C NMR,MS,热重分析和差示热重分析以及Hammett酸度函数进行了表征。发现所制备的阳离子型离子液体是在无溶剂条件下用于合成黄二酮和3,4-二氢嘧啶-2(1 H)-one的有效且可重复使用的催化剂。所开发方法的优点包括离子液体的新颖性,离子液体的易于制备,易于后处理,催化剂的可重复使用性,高收率,短的反应时间以及不存在有毒的有机溶剂。