Asymmetric reduction of imines with trichlorosilane catalyzed by valine-derived formamide immobilized onto magnetic nano-Fe<sub>3</sub>O<sub>4</sub>
作者:Xin Ge、Chao Qian、Xiaoming Ye、Xinzhi Chen
DOI:10.1039/c5ra08516k
日期:——
were synthesized by anchoring valine-derived formamide onto the surface of Fe3O4 magnetic nanoparticles, which were applied in the asymmetric reduction of imines with trichlorosilane at room temperature in toluene. The high level of yield and enantioselectivity catalyzed by magnetic nano-Fe3O4-supported organocatalysts was obtained. In the immobilization process, CuI-catalyzed azide-alkyne 1,3-dipolar
通过将缬氨酸衍生的甲酰胺固定在Fe 3 O 4磁性纳米颗粒的表面上,合成了磁性纳米Fe 3 O 4负载的有机催化剂,并将其应用于室温下用三氯硅烷在甲苯中不对称还原亚胺。获得了磁性纳米Fe 3 O 4负载的有机催化剂催化的高产率和对映选择性。在固定过程中,Cu I催化的叠氮化物-炔烃1,3-偶极环加成(CuAAC)“点击化学”用作锚定桥。磁性纳米颗粒可以简化有机催化剂的回收及其从反应体系中的分离。通过外部磁体,催化剂可以循环使用五次,而活性没有明显下降。