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
Nickel-Catalyzed Monofluoroalkylation of Arylsilanes via Hiyama Cross-Coupling
作者:Yun Wu、Hao-Ran Zhang、Yi-Xuan Cao、Quan Lan、Xi-Sheng Wang
DOI:10.1021/acs.orglett.6b02803
日期:2016.11.4
first example of nickel-catalyzed monofluoroalkylation of arylsilanes has been developed with readily available fluoroalkyl halides. This novel transformation has demonstrated high reactivity, broad substrate scope, excellent functional group tolerance, and mild reaction conditions. The selective activation of a relatively inert C–Si bond for slow release of aryl carbanion is the key reason for reducing
Improved Synthesis of Aryltrialkoxysilanes via Treatment of Aryl Grignard or Lithium Reagents with Tetraalkyl Orthosilicates
作者:Amy S. Manoso、Chuljin Ahn、Arash Soheili、Christopher J. Handy、Reuben Correia、W. Michael Seganish、Philip DeShong
DOI:10.1021/jo048667h
日期:2004.11.1
General reaction conditions for the synthesis of aryl(trialkoxy)silanes from aryl Grignard and lithium reagents and tetraalkyl orthosilicates (Si(OR)4) have been developed. Ortho-, meta-, and para-substituted bromoarenes underwent efficient metalation and silylation at low temperature to provide aryl siloxanes. Mixed results were obtained with heteroaromatic substrates: 3-bromothiophene, 3-bromo-4-methoxypyridine
A palladium-catalyzed domino Heck cyclization/Hiyama cross-coupling has been achieved for the synthesis of (hetero)aryl-functionalized azaindoline derivatives bearing all-carbon quaternary centers in 46–85% yields. The synthetic versatility of this protocol has been highlighted by the gram-scale synthesis and modification of aryl-containing complex bioactive molecules.