A silica-supported titanium catalyst for heterogeneous hydroamination and multicomponent coupling reactions
作者:Kelly E. Aldrich、Aaron L. Odom
DOI:10.1039/c9dt01835b
日期:——
bound to the surface, on average, through a single O–Si–Ti linkage. This material was tested for its properties as a catalyst for C–N bond forming reactions and was found to be a competent alkyne hydroamination and iminoamination catalyst. For iminoamination, which is the 3-component coupling of an alkyne, primary amine, and isonitrile, this heterogeneous catalyst was able to carry out some catalyses
高度脱水的硅胶SiO 2 700得到的材料的总表面羟基密度为0.31±0.05 mmol g -1,每nm 2具有0.9±0.1个Si-OH位。用Ti(NMe 2)4处理该材料得到Ti(NMe 2)3 / SiO 2 700,这是1.50%±0.07 Ti,其中钛平均通过单个O-Si-Ti键与表面结合。测试了该材料作为C–N键形成反应的催化剂的性能,发现它是有效的炔烃加氢胺化和亚氨基化催化剂。对于亚胺化(这是炔烃,伯胺和异腈的三组分偶联),这种多相催化剂能够以比以前报道的均相催化剂更快的方式进行某些催化剂,并且催化剂负载量较低。该材料还是将苯胺加成到二环己基碳二亚胺上以形成取代的胍的催化剂。另外,使用一锅法,使用先前报道的合成的一半催化剂负载量,使用多相催化剂制备了具有生物活性的已知喹啉。