<i>N</i>-Methylation of Aniline Derivatives with CO<sub>2</sub> and Phenylsilane Catalyzed by Lanthanum Hydridotriarylborate Complexes bearing a Nitrogen Tridentate Ligand
作者:Koichi Shinohara、Hayato Tsurugi、Kazushi Mashima
DOI:10.1021/acscatal.2c01658
日期:2022.7.15
A lanthanum amide complex, La(L)[N(SiHMe2)2](thf) (L = N,N″-bis(pentafluorophenyl)diethylenetriamine dianion, 1a), upon activation with B(3,4,5-F2C6H2)3 (2a), showed excellent catalytic activity for N-methylation of N-alkylaniline derivatives with CO2 in the presence of PhSiH3. A catalytically active lanthanum hydridotriarylborate complex, [La(L)(thf)2][HB(3,4,5-F3C6H2)3] (5aa), was generated via hydride
镧酰胺络合物,La( L )[N(SiHMe 2 ) 2 ](thf) ( L = N , N ″-bis(pentafluorophenyl)diethylenetriamine dianion, 1a ),用 B(3,4,5-F 活化2 C 6 H 2 ) 3 ( 2a )在PhSiH 3存在下对CO 2对N-烷基苯胺衍生物的N-甲基化表现出优异的催化活性。催化活性氢化三芳基硼酸镧络合物,[La( L )(thf) 2 ][HB(3,4,5-F3 C 6 H 2 ) 3 ] ( 5aa ) 是由中等路易斯酸2a在 THF 中通过氢化物从1a的 Si-H 部分中提取而生成的。CO 2氢化硅烷化步骤的 DFT 研究阐明了以下多种非共价相互作用是定位 HB(3,4,5-F 2 C 6 H 2 ) 3阴离子和 B(3,4,5-F 3 C 6的关键因素H 2 ) 3在CO 2的过渡态中靠近镧中心还原和