Highly efficient solvent-free aza-Michael additions of a variety of amines to α,β-unsaturated carbonyl compounds under microwave-irradiation conditions catalyzed by perchloric acid impregnated on silica gel (HClO4/SiO2) is reported. The reactions are completed within 2–7 min in a microwave oven to produce the corresponding adducts in excellent yields, and the catalyst can be recovered and reused.
摘要
高氯酸浸渍
硅胶 (HClO4/SiO2) 催化微波辐射条件下,多种胺与 α,β-不饱和羰基化合物的高效无溶剂氮杂-迈克尔加成反应。反应在微波炉中 2-7 分钟内完成,以优异的收率产生相应的加合物,并且催化剂可以回收和重复使用。