The substituent redistribution of hydrosilanes on silicon through C–Si and Si–H bond cleavage and reformation is of great interest and importance, but this transformation is usually difficult to achieve in a selective fashion. By using electron-rich aromatic hydrosilanes, we have achieved for the first time the selective C–Si/Si–H bond homo- and cross-metathesis of a series of hydrosilanes in the presence
通过C-Si和Si-H键的裂解和重整作用,氢硅烷在硅上的取代基重新分布引起人们极大的兴趣和重要性,但是这种转化通常很难以选择性的方式实现。通过使用富含电子的芳族氢硅烷,我们首次实现了在硼催化剂B(C 6 F 5)存在下一系列氢硅烷的选择性C-Si / Si-H键均位和交叉复分解。3。该方案具有简单的反应条件,高的化学选择性,宽的底物范围和高的功能耐受性,为合成多取代的功能性硅烷提供了一条新途径。
Facile Isomerization of a Tungsten Silyl Complex to a Base-Stabilized Silylene Complex via 1,2-Migration of an Aryl Group
Irradiation of CP*(CO)(3)WMe in the presence of N,N-dimethyl-2-(dimethylsilyl)aniline led to the intermediate formation of Cp*(CO)(2)Wkappa(2)(Si,N)-Me2N(o-C6H4SiMe2)} (3), which was converted to the base-stabilized silylene complex Cp*(CO)(2)Wkappa(2)(Si,C)-SiMe2-NMe2(o-C6H4)} (2) through 1,2-migration of the aryl group.
Ruthenium-Catalyzed Site-Selective Intramolecular Silylation of Primary C–H Bonds for Synthesis of Sila-Heterocycles
作者:Huaquan Fang、Wenjun Hou、Guixia Liu、Zheng Huang
DOI:10.1021/jacs.7b06798
日期:2017.8.23
medicinal chemistry. Moreover, organosilanes are valuable synthetic intermediates for fine chemicals and materials. Transition metal-catalyzed C-H silylation has become an important strategy for C-Si bondformations. However, despite the great advances in aromatic C(sp2)-H bond silylations, catalytic methods for aliphatic C(sp3)-H bond silylations are relatively rare. Here we report a pincer ruthenium