Cobalt-catalyzed carboxylation of aryl and vinyl chlorides with CO<sub>2</sub>
作者:Yanwei Wang、Xiaomei Jiang、Baiquan Wang
DOI:10.1039/d0cc06451c
日期:——
The transition-metal-catalyzed carboxylation of aryl and vinylchlorides with CO2 is rarely studied, and has been achieved only with a Ni catalyst or combination of palladium and photoredox. In this work, the cobalt-catalyzed carboxylation of aryl and vinylchlorides and bromides with CO2 has been developed. These transformations proceed under mild conditions and exhibit a broad substrate scope, affording
Synthesis of (Hetero)aryl/Alkenyl Iodides via Ni-Catalyzed Finkelstein Reaction from Bromides or Chlorides
作者:Jian-Xing Liang、Peng-Fei Yang、Wei Shu
DOI:10.1021/acs.organomet.2c00509
日期:2022.12.26
value-added targets in organic synthesis and common motifs in natural products and bioactive molecules. Thus, direct synthesis of aryl/alkenyl iodides from easily available and cost-effective materials under mild conditions is attractive. Herein, we reported a nickel-catalyzed Finkelstein reaction under mild conditions. Notably, a wide range of aryl/alkenyl bromides as well as chlorides could be transformed
Dual Transition Metal Electrocatalysis: Direct Decarboxylative Alkenylation of Aliphatic Carboxylic Acids
作者:Jiaqing Lu、Yan Yao、Liubo Li、Niankai Fu
DOI:10.1021/jacs.3c08839
日期:2023.12.13
the reaction. This new alkenylation protocol has been successfully demonstrated in direct modification of naturally occurring complex acids and is amenable to the enantioselective decarboxylative alkenylation of arylacetic acid. Mechanistic studies, including a series of controlled experiments and cyclic voltammetry data, allow us to probe the key intermediates and the pathway of the reaction.
Synthesis of Vinyl Chlorides via Triphosgene–Pyridine Activation of Ketones
作者:Mirza A. Saputra、Ly Ngo、Rendy Kartika
DOI:10.1021/acs.joc.5b01137
日期:2015.9.4
Herein, we describe a mild method to prepare aliphatic and aromatic vinyl chlorides from their corresponding ketones via triphosgene-pyridine activation in dichloromethane at reflux. The mechanism of this reaction is proposed to involve formation of a putative alpha-chloro pyridinium carbamate intermediate, which appeared to readily undergo E2 elimination in the presence of pyridine.
Nickel-Catalyzed Carboxylation of Aryl and Vinyl Chlorides Employing Carbon Dioxide
Nickel-catalyzed carboxylation of aryl and vinyl chlorides employing carbon dioxide has been developed. The reactions proceeded under a CO2 pressure of 1 atm at room temperature in the presence of nickel catalysts and Mn powder as a reducing agent. Various aryl chlorides could be converted to the corresponding carboxylic acid in good to high yields. Furthermore, vinyl chlorides were successfully carboxylated with CO2. Mechanistic study suggests that Ni(I) species is involved in the catalytic cycle.