The Remarkable Cooperative Effect of a Brønsted-Acidic Ionic Liquid in the Cyclization of 2-Aminobenzamides with Ketones
作者:Sudarshan Das、Sougata Santra、Sourav Jana、Grigory V. Zyryanov、Adinath Majee、Alakananda Hajra
DOI:10.1002/ejoc.201700966
日期:2017.9.8
lower E factor. The catalyst can be reused for five consecutive runs without any significant loss of catalytic activities. This method produced only water as the byproduct and represents a green synthetic protocol. Clean reaction, non-chromatographic purification technique, easily accessible reactants, metal and solvent-free and environmentally friendly reaction conditions are the notable advantages
在形成2,2-二取代的喹唑啉-4(1H)-一衍生物的过程中,发现了咪唑鎓布朗斯台德酸性离子液体的空前作用,其中咪唑鎓部分的C2-H和酸性质子都是必需的,并且同时参与催化。通过容易获得的酮和2-氨基苯甲酰胺,通过在无溶剂条件下以较低的E因子简单结晶,以优异的收率制备了喹唑啉-4(1H)-酮的文库。该催化剂可连续使用五次,而不会明显降低催化活性。该方法仅产生水作为副产物,代表绿色的合成方案。干净的反应,非色谱纯化技术,容易获得的反应物,无金属,无溶剂和环境友好的反应条件是该程序的显着优势。通过质谱研究了咪唑鎓部分的C2-H在催化中的可能作用。