SiO_2微球负载的CeCl_3·7H_2O-NaI催化邻氨基苯硫酚与高位阻α,β-不饱和酮的Michael加成及其串联反应  

Michael Addition and Tandem Reaction of Aminothiphenols with α,β-Unsaturated Ketones with High Steric Hindrance Catalyzed by CeCl_3·7H_2O-NaI Supported on SiO_2 Microsphere

作　　者：张艺扬 穆博帅 李媛[1] 

机构地区：[1]河北师范大学化学与材料科学学院,石家庄050024

出　　处：《有机化学》2015年第11期2347-2357,共11页Chinese Journal of Organic Chemistry

基　　金：国家自然科学基金(No.20972040)资助项目~~

摘　　要：以粒径为5μm的SiO2微球为载体,制备了CeCl3·7H2O-NaI/SiO2负载催化剂,用SEM、EDS和XRD对其结构进行表征,并考察了该催化剂对邻氨基苯硫酚和高位阻α,β-不饱和酮的Michael加成及Michael加成-胺酮缩合串联反应的催化性能.研究结果表明,该催化体系能够很好地催化邻氨基苯硫酚类亲核试剂与高位阻α,β-不饱和酮反应,得到中等及优良的产率;催化剂使用5次,其形貌不变,但金属铈有少量流失,致使其催化活性有所下降.研究还发现,该催化剂对该串联反应的催化模式为,既催化Michael加成又催化胺酮缩合反应.Using Si O2 microsphere with size of 5 μm as support, Ce Cl3·7H2O-Na I/Si O2 supported catalyst was prepared and characterized by SEM, EDS and XDR techniques and its catalytic performance for Michael addition and tandem Michael addition/condensation reactions between aminothiophenols and α,β-unsaturated ketones with high steric hindrance were investigated. The experimental results showed that Ce Cl3·7H2O-Na I/Si O2 can catalyzed above reactions in moderate to good yields. When the catalyst was used fifth times, its morphology was largely unchanged, but its catalytic activity decreased for losing of small amounts of metal cerium in the process of catalyzing. It was also found that Ce Cl3·7H2O-Na I/Si O2 can catalyze both the Michael addition of aminothiophenols to α,β-unsaturated ketones and the condensation reaction between ketones and amines.

关 键 词：MICHAEL加成反应 串联反应 CeCl3·7H2O-NaI SIO2微球 负载催化剂 

分 类 号：O621.251[理学—有机化学]