Development of a Palladium-Catalyzed Process for the Synthesis of<i>Z</i>-Alkenes by Sequential Sonogashira-Hydrogenation Reaction
作者:Sören Hancker、Helfried Neumann、Matthias Beller
DOI:10.1002/ejoc.201800651
日期:2018.10.17
A selective one‐pot protocol for the synthesis of Z‐alkenes via Sonogashira–semihydrogenation is reported. In this process the original homogeneous palladium catalyst is transformed into an active heterogeneous material.
Pd-Catalyzed reductive heck reaction of olefins with aryl bromides for Csp<sup>2</sup>–Csp<sup>3</sup> bond formation
作者:Liqun Jin、Jiaxia Qian、Nan Sun、Baoxiang Hu、Zhenlu Shen、Xinquan Hu
DOI:10.1039/c8cc02571a
日期:——
We developed a Pd-catalyzed intermolecular reductive Heck reaction to construct Csp2–Csp3 bonds between arylbromides and olefins. Various styrene derivatives, acyclic and cyclic alkenes, were well tolerated to couple with varied arylbromides in linear selectivity. Kinetic and deuterium labeling experiments suggested that i-PrOH provides a hydride through β-H elimination.
Selective Catalytic C–H Alkylation of Alkenes with Alcohols
作者:Dong-Hwan Lee、Ki-Hyeok Kwon、Chae S. Yi
DOI:10.1126/science.1208839
日期:2011.9.16
A ruthenium catalyst forms carbon-carbon bonds between olefins and alcohols while liberating only water as a by-product. Alkenes and alcohols are among the most abundant and commonly used organic feedstock in industrial processes. We report a selective catalytic alkylation reaction of alkenes with alcohols that forms a carbon-carbon bond between vinyl carbon-hydrogen (C–H) and carbon-hydroxy centers
Cross-coupling of alkyl halides with aryl or alkyl Grignards catalyzed by dinuclear Ni(ii) complexes containing functionalized tripodal amine-pyrazolyl ligands
作者:Fei Xue、Jin Zhao、T. S. Andy Hor
DOI:10.1039/c3dt32111h
日期:——
Structurally distinctive dinuclear Ni(II) complexes with furan or thiophene tethered amine-pyrazolyl tripodal hybrid ligands have been synthesized and crystallographically characterized. All complexes are catalytically active towards cross-coupling of aryl/alkyl Grignard reagents with β-H containing alkyl halides at room temperature in the presence of N,N,N′,N′-tetramethylethylenediamine (TMEDA). The catalytic efficacy of the complexes is dependent on the tether substituent at the central amine. Two species, Ni(II) TMEDA and Mg(II) TMEDA complexes, have been isolated from the catalytic reaction mixtures under different conditions. Some ligand-stabilized Ni(II) and Mg(II) bimetallic species have also been identified in the ESI-MS spectra.
Iron(<scp>iii</scp>) amine-bis(phenolate) complexes as catalysts for the coupling of alkyl halides with aryl Grignard reagents
作者:Rajoshree Roy Chowdhury、Angela K. Crane、Candace Fowler、Philip Kwong、Christopher M. Kozak
DOI:10.1039/b713647a
日期:——
Catalytic cross-coupling of aryl Grignard reagents with primary and secondary alkyl halides bearing beta-hydrogens is achieved using Fe(III) amine-bis(phenolate) halide complexes.