MgO nanoparticles were prepared by an improved sol–gel technique which appeared to have narrow size distributions. The synthesized magnesium oxide nanoparticles were used as an efficient catalyst in aza-Michael reaction for addition of amines to a series of α,β-unsaturated carbonyl compounds and nitro olefins under solvent-free conditions at room temperature to afford high yields of the β-amino carbonyl and β-nitro amines. The catalyst can be recovered and reused at least five successive runs without loss of activity.
通过改进的溶胶-凝胶技术制备的MgO纳米颗粒具有较窄的粒径分布。合成的
氧化镁纳米颗粒在无溶剂条件下于室温下作为高效催化剂,用于一系列α,β-不饱和羰基化合物和硝基烯烃的氮迈克尔加成反应中,以及胺的加成反应,从而获得高产率的β-
氨基羰基和β-
硝基胺。该催化剂可回收并在至少五次连续运行中重复使用而不会损失活性。