Polyphosphoric acid functionalized silica-coated magnetic nanoparticles with core–shell structure (NiFe2O4@SiO2–PPA) has been used as a magnetically recyclable green catalyst for the one-pot three-component synthesis of 2-thioxoquinazolinones by the reaction of isatoic anhydride, primary amines and thiourea under neat conditions. The catalyst is readily recovered by simple magnetic decantation and can be recycled five times with no significant loss of catalytic activity.
将具有核壳结构的聚
磷酸官能化
二氧化硅包覆磁性纳米粒子(NiFe2O4@SiO2-PPA)作为一种磁性可回收绿色催化剂,用于在纯净条件下通过异酸酐、
伯胺和
硫脲反应一锅三组分合成 2-
硫酮
喹唑啉酮。通过简单的磁性倾析,催化剂很容易回收,而且可以循环使用五次,催化活性不会明显降低。