Palladium-catalyzed denitrative Suzuki coupling of nitroarenes using 2-aryl-5-(2,4,6-triisopropylphenyl)-2,3-imidazolylidene[1,5-a]pyridines as the ligands is described. The key to success is the use of the NHC ligands which show strong donating ability and suitable steric hindrance allowing the successful oxidative addition of Ar–NO2 bonds. Both aromatic and aliphatic boronic acids are tolerated,
描述了使用2-芳基-5-(2,4,6-三异丙基苯基)-2,3-咪唑基亚甲基[1,5- a ]吡啶作为配体的钯催化硝基芳烃的反硝化Suzuki偶联。成功的关键是使用NHC配体,该配体显示出强大的供体能力和适当的空间位阻,可以成功地氧化添加Ar–NO 2键。芳族和脂族硼酸都可以被接受,并且以良好或优异的收率获得了各种联苯和烷基芳烃。
Phosphaadamantanes as Ligands for Palladium Catalyzed Cross-Coupling Chemistry: Library Synthesis, Characterization, and Screening in the Suzuki Coupling of Alkyl Halides and Tosylates Containing β-Hydrogens with Boronic Acids and Alkylboranes
作者:Tim Brenstrum、David A. Gerristma、George M. Adjabeng、Christopher S. Frampton、James Britten、Alan J. Robertson、James McNulty、Alfredo Capretta
DOI:10.1021/jo048875+
日期:2004.10.1
allowed for the rapid determination of the most suitable ligand, specifically 1,3,5,7-tetramethyl-6-(2,4-dimethoxyphenyl)-2,4,8-trioxa-6-phosphaadamantane, for facilitating Suzuki-type couplings of alkylhalides or tosylates containing β-hydrogens with either boronic acids or alkylboranes.
Nickel-Catalyzed Csp<sup>2</sup>–Csp<sup>3</sup>Bond Formation via C–F Bond Activation
作者:Yee Ann Ho、Matthias Leiendecker、Xiangqian Liu、Chengming Wang、Nurtalya Alandini、Magnus Rueping
DOI:10.1021/acs.orglett.8b02351
日期:2018.9.21
A nickel-catalyzed cross coupling of aryl fluorides via C–Fbondactivation has been developed. The alkylation method allows selective replacement of aryl fluorides by alkyl groups and enables the synthesis of diverse and otherwise difficult to access scaffolds in good yields.
Direct Cobalt-Catalyzed Cross-Coupling Between Aryl and Alkyl Halides
作者:Axel Jacobi von Wangelin、Waldemar Czaplik、Matthias Mayer
DOI:10.1055/s-0029-1218012
日期:2009.11
An operationally simple cross-coupling reaction between aryl halides and alkylhalides with high selectivity has been developed. The underlying domino process utilizes CoCl 2 /Me 4 -DACH as a catalyst system. The methodology exhibits high sustainability as it obviates the need for the pre-formation and handling of stoichiometric amounts of hazardous Grignard compounds.
Domino Iron Catalysis: Direct Aryl-Alkyl Cross-Coupling
作者:Waldemar Maximilian Czaplik、Matthias Mayer、Axel Jacobi von Wangelin
DOI:10.1002/anie.200804434
日期:2009.1.5
Striking while the iron is hot: Cheap FeCl3 serves as the precatalyst for the direct cross‐coupling of aryl and alkyl halides that is based on the sequence of Grignard formation and subsequent cross‐coupling. This one‐pot reaction obviates preformation of hazardous Grignard compounds and limits the amount of reactive organomagnesium intermediates to low quasi‐stationary concentrations. TMEDA=N,N,N′