Iron–Nickel Dual-Catalysis: A New Engine for Olefin Functionalization and the Formation of Quaternary Centers
作者:Samantha A. Green、Suhelen Vásquez-Céspedes、Ryan A. Shenvi
DOI:10.1021/jacs.8b05868
日期:2018.9.12
electron-deficient arenes, including Lewis basic heterocycles. Here we report a highly Markovnikov-selective, dual-catalytic olefin hydroarylation that tolerates arenes and heteroarenes of any electronic character. Hydrogen atom transfer controls the formation of branched products and arene halogenation specifies attachment points on the aromatic ring. Mono-, di-, tri-, and tetra-substituted alkenes yield Markovnikov
<i>sp</i><sup>3</sup> C–H Arylation and Alkylation Enabled by the Synergy of Triplet Excited Ketones and Nickel Catalysts
作者:Yangyang Shen、Yiting Gu、Ruben Martin
DOI:10.1021/jacs.8b07405
日期:2018.9.26
polypyridyl complexes. Additionally, such a platform provides a new strategy for streamlining the synthesis of complex molecules with high levels of predictable site-selectivity and preparative utility. Mechanistic experiments suggest that sp3 C-H abstraction occurs via HAT from the ketone triplet excited state. We believe this study will contribute to a more systematic utilization of triplet excited ketones
Direct C(sp<sup>3</sup>)–H Cross Coupling Enabled by Catalytic Generation of Chlorine Radicals
作者:Benjamin J. Shields、Abigail G. Doyle
DOI:10.1021/jacs.6b08397
日期:2016.10.5
Here we report the development of a C(sp3)-H cross-coupling platform enabled by the catalytic generation of chlorine radicals by nickel and photoredox catalysis. Aryl chlorides serve as both cross-coupling partners and the chlorine radical source for the α-oxy C(sp3)-H arylation of cyclic and acyclic ethers. Mechanistic studies suggest that photolysis of a Ni(III) aryl chloride intermediate, generated
作者:Mark W. Campbell、Mingbin Yuan、Viktor C. Polites、Osvaldo Gutierrez、Gary A. Molander
DOI:10.1021/jacs.0c13077
日期:2021.3.17
small molecules is limited by the necessity of prefunctionalization to achieve chemoselective reactivity. Herein, we report the implementation of efficient, sustainable, diaryl ketone hydrogen-atomtransfer (HAT) catalysis to activate native C–H bonds for multicomponent dicarbofunctionalization of alkenes. The ability to forge new carbon–carbon bonds between reagents typically viewed as commodity solvents