Mild Rh(III)-Catalyzed Direct C–H Bond Arylation of (Hetero)Arenes with Arylsilanes in Aqueous Media
摘要:
An efficient rhodium(III)-catalyzed C-H bond activation and further direct arylation of (hetero)arenes with organosilanes in aqueous media was developed. This reaction shows good substrate scope and excellent functional group compatibility and gives the products in good yields with excellent regioselectivity.
A rhodium-catalyzed C–H functionalization with activated amides by decarbonylation has been developed. Notably, this is the first C–H arylation employing N-acylsaccharins as coupling partners to give biaryls in good to excellent yields. The highlight of the work is the high tolerance of functional groups such as formyl, ester, and vinyl and the use of a removable directing group.
Herein, we report that unstrained ketones can be efficiently employed as electrophiles in Suzuki–Miyaura reactions via catalytic activation of unstrained C–C bonds assist by an N-containing directing group. A wide range of aromatic ketones directly coupled with boronic ester with excellent functional group tolerance. This strategy provides an alternative and versatile approach to constructing biaryls
Rhodium-catalyzed regioselective direct C–H arylation of indoles with aryl boronic acids
作者:Liang Wang、Xing Qu、Zhan Li、Wang-Ming Peng
DOI:10.1016/j.tetlet.2015.04.015
日期:2015.6
A highly efficient Rh(III)-catalyzed direct C–H arylation of indoles with arylboronicacids under mild conditions has been developed. The methodology features wide substrate scope and excellent functional group compatibility (34 examples, up to 99% yield). The arylated products can also be conveniently transformed into biologically active polycyclic indole derivatives.
We report a chelation-assisted C–H arylation of various indoles with sterically and electronically diverse (hetero)arylsilanes enabled by cost-effective Cp*-free cobaltcatalysis. Key to the success of this strategy is the judicious choice of copper(II) fluoride as a bifunctional sliane activator and catalyst reoxidant. This methodology features a broad substrate scope and good functional group compatibility
Cobalt(II)-Catalyzed Oxidative C–H Arylation of Indoles and Boronic Acids
作者:Xinju Zhu、Jian-Hang Su、Cong Du、Zheng-Long Wang、Chang-Jiu Ren、Jun-Long Niu、Mao-Ping Song
DOI:10.1021/acs.orglett.6b03746
日期:2017.2.3
Co(II)-catalyzed C–H C2 selective arylation of indoles with boronic acids through monodentate chelation assistance has been achieved for the first time. The unique features of this methodology include mild reaction conditions, highly C2 regioselectivity, and employment of a Grignard reagent-free catalytic system. A wide range of substrates, including unreactive arenes, are well tolerated, which enables