Herein, a rhodium-catalyzed desymmetrization of dihydrosilanes with heterocyclic compounds via intermolecular dehydrogenative C–H silylation is developed.
Enantioselective Nickel‐Catalyzed Hydrosilylation of 1,1‐Disubstituted Allenes
作者:Tao Liu、Xin‐Rui Mao、Shuo Song、Zi‐Yang Chen、Yichen Wu、Li‐Ping Xu、Peng Wang
DOI:10.1002/anie.202216878
日期:2023.3.6
SPSiOL-base bisphosphite ligand (SPSiPO), Ni-catalyzed asymmetric hydrosilylation of 1,1-disubstituted allenes was realized for the first time, delivering the enantioenriched allylsilanes bearing a tertiary carbon stereocenter in high efficiency and 100 % atom-economy with high chemo-, regio- and enantioselectivities.
使用新开发的基于 SPSiOL 的双亚磷酸酯配体 (SPSiPO),首次实现了 Ni 催化的 1,1-二取代丙二烯的不对称氢化硅烷化反应,以高效率和 100% 原子经济性提供带有叔碳立构中心的对映体富集的烯丙基硅烷具有高化学选择性、区域选择性和对映选择性。
Selective Access to Silacyclopentanes and Homoallylsilanes by La-Catalyzed Hydrosilylations of 1-Aryl Methylenecyclopropanes
作者:Xiaoming Xu、Ailin Gao、Xiufang Xu、Jianfeng Li、Chunming Cui
DOI:10.1021/jacs.3c12355
日期:2024.2.14
their unique reactivity. However, metal-catalyzed hydrosilylation of MCPs has met with very limited successes. In this paper, catalytic selective hydrosilylations of MCPs with some primary silanes using an ene-diamido lanthanum ate complex as the catalyst were described. The catalytic reactions resulted in the selective formation of silacyclopentanes and (E)-homoallylsilanes, respectively, depending on
The nuanced role of spin effects remains a critical gap in designing proficient open‐shell catalysts. This study elucidates an iron‐catalyzed allylic C(sp3)−H silylation/alkyne hydrosilylation reaction, in which the spin state of the open‐shell iron catalyst dictates the reaction kinetics and pathway. Specifically, spin crossover led to alkyne hydrosilylation, whereas spin conservation resulted in a novel allylic C(sp3)−H silylation reaction. This chemoselectivity, governed by the spin‐crossover efficiency, reveals an unexpected dimension in spin effects and a first in the realm of transition‐metal‐catalyzed in situ silylation of allylic C(sp3)−H bonds, which had been previously inhibited by the heightened reactivity of alkenes in hydrosilylation reactions. Furthermore, this spin crossover can either accelerate or hinder the reaction at different stages within a single catalytic reaction, a phenomenon scarcely documented. Moreover, we identify a substrate‐assisted C−H activation mechanism, a departure from known ligand‐assisted processes, offering a fresh perspective on C−H activation strategies.