Substrate-Dependent Mechanistic Divergence in Decarboxylative Heck Reaction at Room Temperature
作者:Asik Hossian、Samir Kumar Bhunia、Ranjan Jana
DOI:10.1021/acs.joc.6b00100
日期:2016.3.18
We report herein a Pd(II)-catalyzed Heck-type coupling between arene carboxylic acids and alkenes at room temperature. Mechanistically, the reaction proceeds in two distinct pathways where electron-rich substrates undergo a palladium(II)-catalyzed decarboxylation and electron-deficient substrates proceed through silver(I)-assisted decarboxylation. Dimethylsulfoxide (DMSO) or sulfide ligands have positive
A Facile Synthesis of Pentafluorophenyl Olefins<i>via</i>an Arsonium Ylide
作者:Yanchang Shen、Weiming Qiu
DOI:10.1055/s-1987-27848
日期:——
The in situ reaction of (pentafluorophenylmethylene)triphenylarsorane, generated from methylenetriphenylarsorane and hexafluorobenzene, with aromatic aldehydes gives good to excellent yields of pentafluorophenyl olefins with high stereoselectivity.
A methyl(phenyl)sulfane-promoted direct olefination of polyfluoroarenes catalyzed by palladium has been reported. With use of this new thioether ligand, a high reaction efficiency and excellent E/Z ratio of desired olefinated polyfluoroarenes were obtained. This represents a first example of thioether promoted oxidative Heck reaction.
Pd-catalyzed aerobic direct olefination of polyfluoroarenes
作者:Chun-Yang He、Feng-Ling Qing、Xingang Zhang
DOI:10.1016/j.tetlet.2014.03.096
日期:2014.4
The first example of Pd-catalyzed aerobic direct olefination of polyfluoroarenes has been developed. The reaction makes use of molecular O-2 as terminal oxidant, and provides a cost-efficient and environmentally benign access to polyfluoroarene-alkene structures that are of interest in life and material sciences. (C) 2014 Elsevier Ltd. All rights reserved.