Acidic-functionalized ionic liquid as an efficient, green and reusable catalyst for hetero-Michael addition of nitrogen, sulfur and oxygen nucleophiles to α,β-unsaturated ketones
作者:Feng Han、Lei Yang、Zhen Li、Chungu Xia
DOI:10.1039/c1ob06346d
日期:——
A series of acidic-functionalized ionic liquids were synthesized and applied to the hetero-Michael addition of nitrogen, sulfur and oxygen nucleophiles to α,β-unsaturated ketones under solvent-free conditions. Notably, 1-methylimidazoliump-toluenesulfonic ([Hmim]OTs) was found to be the most efficient catalyst and could realize âhomogeneous catalysis, two-phase separationâ. Additionally, the catalytic system has wide substrate scope and good to excellent yields (up to 99%) could be obtained at room temperature.
一系列酸性功能化的离子液体被合成并应用于无溶剂条件下氮、硫和氧亲核试剂对α,β-不饱和酮的加成反应。值得注意的是,1-甲基咪唑对甲苯磺酸([Hmim]OTs)被发现是最有效的催化剂,并能实现“均相催化,两相分离”。此外,该催化体系具有广泛的底物适用范围,并且在室温下能够获得良好至极佳的产率(高达99%)。