Transition-Metal-Catalyzed Formation of <i>trans </i>Alkenes via Coupling of Aldehydes
作者:Shifa Zhu、Yuanxi Liao、Shizheng Zhu
DOI:10.1021/ol036197s
日期:2004.2.1
[reaction: see text] Rh(2)(OAc)(4) catalyzed the formation of exclusively trans fluorinated alkenes from aldehydes and pentafluorobenzaldehyde tosylhydrazone salts, which were readily prepared from pentafluorobenzaldehyde using the Bamford-Stevens reaction. A series of pentafluorophenyl-containing alkenes were synthesized from aldehydes in moderate to good yields under mild reaction conditions in a
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
Palladium-Catalyzed Olefination and Arylation of Polyfluoroarenes Using Molecular Oxygen as the Sole Oxidant
作者:Qiufeng Huang、Xinyu Zhang、Lin Qiu、Jiajun Wu、Hanbing Xiao、Xiaofeng Zhang、Shen Lin
DOI:10.1002/adsc.201500632
日期:2015.11.16
The palladium-catalyzed cross-dehydrogenative-coupling of polyfluoroarenes with alkenes or simple arenes has been developed. The approach is characterized by using atmospheric pressure of molecularoxygen as the sole oxidant, and provides a straightforward and environmentally benign route to functionalized polyfluoroarenes.
Palladium-Catalysed Desulfitative Heck Reaction Tolerant to Aryl Carbon–Halogen Bonds for Access to (Poly)halo-Substituted Stilbene or Cinnamate Derivatives
(poly)halo-substituted benzenesulfonylchlorides with alkenes was investigated. Styrene or acrylates in the presence of bromo- or iodobenzenesulfonyl chlorides and a phosphine-free palladium catalyst were found to afford the expected β-arylated Heck type products with complete regio- and stereoselectivities. The reaction tolerates a variety of substituents on the halobenzenesulfonyl chloride. Moreover, no cleavage
Rh Catalyzed C–H Activation and Oxidative Olefination without Chelate Assistance: On the Reactivity of Bromoarenes
作者:Frederic W. Patureau、Corinna Nimphius、Frank Glorius
DOI:10.1021/ol202557w
日期:2011.12.16
A Rh catalyzed, no-chelate-assisted C-H activation/oxidative olefination reaction of bromoarenes has been discovered, in which the latter ones seem to act as a substrate, terminal oxidant, and catalyst modifier.