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.
A highly selective hydrogenation of alkynesusing an air-stable and readily available manganese catalyst has been achieved. The reaction proceeds under mild reaction conditions and tolerates various functional groups, resulting in (Z)-alkenes and allylic alcohols in high yields. Mechanistic experiments suggest that the reaction proceeds via a bifunctional activation involving metal–ligand cooperativity
Manganese-Catalyzed Cross-Coupling Reaction between Aryl Grignard Reagents and Alkenyl Halides
作者:Gérard Cahiez、Olivier Gager、Fabien Lecomte
DOI:10.1021/ol802273e
日期:2008.11.20
Aryl Grignard reagents react stereospecifically with alkenylhalides in the presence of manganese chloride (10%) to afford good yields of cross-coupling products.
芳基格氏试剂在氯化锰(10%)存在下与烯基卤化物立体定向反应,以提供良好的交叉偶联产物收率。
Pd Nanoparticles Immobilized on Fe3O4 @ Poly(ethylene glycol) Bridged Amine Functionalized Imidazolium Ionic Liquid: A Magnetically Separable Catalyst for Heck in Water
作者:Xiang Liu、Xiaohua Zhao、Ming Lu
DOI:10.1007/s10562-015-1534-3
日期:2015.8
Abstract A palladium-based catalyst supported on novel Fe3O4 @ Poly(ethylene glycol) bridged amine functionalized imidazolium ionicliquid (Fe3O4@PEG–AIm–NH2–IL) was successfully prepared by a facile method. The catalyst was characterized by FT-IR, TEM, VSM, XRD, XPS and TGA-DSC, which showed high activity and stability for the Heck reaction in pure water. Furthermore, the catalyst could be recovered in
General Copper-Catalyzed Coupling of Alkyl-, Aryl-, and Alkynylaluminum Reagents with Organohalides
作者:Bijay Shrestha、Surendra Thapa、Santosh K. Gurung、Ryan A. S. Pike、Ramesh Giri
DOI:10.1021/acs.joc.5b02077
日期:2016.2.5
We report the first example of a very general Cu-catalyzed cross-coupling of organoaluminum reagents with organohalides. The reactions proceed for the couplings of alkyl-, aryl-, and alkynylaluminum reagents with aryl and heteroarylhalides and vinyl bromides, affording the cross-coupled products in good to excellent yields. Both primary and secondary alkylaluminum reagents can be utilized as organometallic