Visible‐Light‐Induced Vicinal Dichlorination of Alkenes through LMCT Excitation of CuCl
<sub>2</sub>
作者:Pengcheng Lian、Wenhao Long、Jingjing Li、Yonggao Zheng、Xiaobing Wan
DOI:10.1002/ange.202010801
日期:2020.12.21
AbstractThis work demonstrates photoredox vicinal dichlorination of alkenes, based on the homolysis of CuCl2 in response to irradiation with visible light. This catalysis proceeds via a ligand to metal charge transfer process and provides an exciting opportunity for the synthesis of 1,2‐dichloride compounds using an inexpensive, low‐molecular‐weight chlorine source. This new process exhibits a wide
convenient reaction for oxidative trifluoromethylation of terminal alkenes was developed using in situ generated AgCF3 in the presence of a copper catalyst. The reaction proceeded under an air atmosphere to afford trifluoromethylated allylic compounds in moderate to good yield. This reaction, with no need for highly hygroscopic or corrosive reagents, features not only a simple operation but also various functional
Light-Mediated Dual Phosphine-/Copper-Catalyzed Atom Transfer Radical Addition Reaction
作者:Oleg V. Fedorov、Sofya I. Scherbinina、Vitalij V. Levin、Alexander D. Dilman
DOI:10.1021/acs.joc.9b01649
日期:2019.9.6
The atomtransferradicaladdition reaction catalyzed by triphenylphosphine and copper(I) halide is described. The reaction proceeds under irradiation with 365 nm light using a light-emitting diode and was performed in regular glassware. The proposed mechanism involves the formation of quaternary phosphonium salt, which undergoes single electron reduction by copper(I) salt via photo-induced electron
Atom-transfer radical addition of fluoroalkyl bromides to alkenes <i>via</i> a photoredox/copper catalytic system
作者:Vladislav S. Kostromitin、Artem A. Zemtsov、Vladimir A. Kokorekin、Vitalij V. Levin、Alexander D. Dilman
DOI:10.1039/d1cc01609a
日期:——
A method for the addition of fluorinated alkyl bromides to alkenes is described. The reaction proceeds under visible light irradiation in the presence of two catalysts: Ir(ppy)3 and N-heterocycliccarbeneligated copper bromide (IMesCuBr). The role of the iridium photocatalyst is to generate the fluoralkyl radical, while the copper promotes formation of the carbon–bromine bond.
A KI-mediated radical anti-Markovnikov addition of simple ketones/esters to unactivated alkenes
作者:Yunfei Tian、Changqing Sun、Ren Xiang Tan、Zhong-Quan Liu
DOI:10.1039/c7gc03745g
日期:——
A KI-mediated radical anti-Markovnikov addition of simple ketones and esters to unactivated alkenes was developed. Through this strategy, a wide range of complex carbonyl compounds can be conveniently synthesized in high selectivities. In addition, this method features high atom-economy and is transition-metal free, operationally simple and environmentally benign.