A new green chemical method for the aza-Michael reaction of nitrogenheterocycles with enones in water as a solvent without the use of any catalysts under high-pressure conditions is described.
which allows functionalization to occur exclusively at the β-position of ketones. The substrate scope includes a wide range of cycloalkanols as well as diverse N, O, C, and P-centered nucleophiles, providing ready access to β-functionalized ketones as products. Mechanistic studies support the generation of α,β-unsaturated ketones as key intermediates followed by Michael addition with nucleophiles.
已经研究了环烷醇与亲核试剂的电化学解构官能化,这使得官能化只发生在酮的β-位。底物范围包括范围广泛的环烷醇以及各种以 N、O、C 和 P 为中心的亲核试剂,可方便地使用 β-官能化酮作为产品。机理研究支持生成 α,β-不饱和酮作为关键中间体,然后与亲核试剂进行迈克尔加成。
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.