Brønsted acidic ionic liquid-catalyzed tandem reaction: an efficient approach towards regioselective synthesis of pyrano[3,2-c]coumarins under solvent-free conditions bearing lower E-factors
作者:Sachinta Mahato、Sougata Santra、Rana Chatterjee、Grigory V. Zyryanov、Alakananda Hajra、Adinath Majee
DOI:10.1039/c7gc01158j
日期:——
and represents a green synthetic protocol. The catalytic reaction proceeded very smoothly under solvent-free conditions and showed high regioselectivity. Clean reaction, non-chromatographic purification technique, easily accessible reactants, metal and solvent-free and environmentally friendly reaction conditions are the notable advantages of this procedure. In addition, this method possesses lower E-Factors
发现1-丁烷磺酸-3-甲基咪唑鎓甲苯磺酸盐,[BSMIM] OTs是在无溶剂条件下将4-羟基香豆素与查耳酮串联环化以合成吡喃并[3,2-c]香豆素的出色催化剂。 。所开发的方案适用于从具有各种取代基的易于接近的查耳酮构建生物学上重要的吡喃香豆素。该反应可能通过迈克尔加成反应然后环化进行。还证明了催化剂再循环的可行性。该方法仅产生水作为副产物,代表绿色的合成方案。在无溶剂条件下,催化反应进行得非常顺利,并具有很高的区域选择性。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。另外,该方法具有较低的电子因子。