Palladium-Catalyzed Coupling Reaction of Perfluoroarenes with Diarylzinc Compounds
作者:Masato Ohashi、Ryohei Doi、Sensuke Ogoshi
DOI:10.1002/chem.201303451
日期:2014.2.10
to promote the oxidative addition of one CF bond of C6F6 to palladium. Stoichiometric reactions revealed that an expected oxidative‐addition product, trans‐[Pd(C6F5)I(PCy3)2], generated from the reaction of [Pd(PCy3)2] with C6F6 in the presence of lithium iodide, was not involved in the catalytic cycle. Instead, a transient three‐coordinate, monophosphine‐ligated species, [Pd(C6F5)I(PCy3)], emerged
该报告描述了六氟苯(C 6 F 6)与二芳基锌化合物的首次Pd 0催化交叉偶联,得到了多种五氟苯基芳烃。该反应可以应用于其他全氟芳烃,例如八氟甲苯,五氟吡啶和全氟萘,以得到相应的多氟偶联产物。在该催化反应中的最佳配体是PCy 3,碘化锂作为偶联反应的添加剂是必不可少的。碘化锂在该催化反应中的作用之一是促进C 6 F 6的一个CF键的氧化加成。钯。化学计量反应表明,在存在条件下,[Pd(PCy 3)2 ]与C 6 F 6的反应产生了预期的氧化加成产物反式[Pd(C 6 F 5)I(PCy 3)2 ]。碘化锂的一部分不参与催化循环。取而代之的是,瞬态三配位单膦连接的物质[Pd(C 6 F 5)I(PCy 3)]出现为催化循环中的潜在中间体。因此,我们分离了一种新型的Pd II复合物[Pd(C 6 F 5)I(PCy3)(py)],其中吡啶(py)充当不稳定的配体以生成瞬态物质。实际上,在碘化锂的存在下,发现该Pd
Synthesis of Polyflourinated Biphenyls; Pushing the Boundaries of Suzuki–Miyaura Cross Coupling with Electron-Poor Substrates
作者:David Bulfield、Stefan M. Huber
DOI:10.1021/acs.joc.7b02267
日期:2017.12.15
different applications. Unfortunately, all current methods for the syntheses of these compounds only work for a hand full of molecules or only in very special cases. Thus, many of these compounds are still inaccessible to date. Here we report a general strategy for the synthesis of a wide range of highly fluorinated biphenyls. In our studies we investigated crucial parameters, such as different phosphine
Pyrazolin-5-ylidene Palladium(II) Complexes: Synthesis, Characterization, and Application in the Direct Arylation of Pentafluorobenzene
作者:Jan C. Bernhammer、Han Vinh Huynh
DOI:10.1021/om300464b
日期:2012.7.23
Ten palladium(II) complexes bearing a pyrazolin-5-ylidene ligand have been synthesized by oxidative addition and silvercarbene transfer pathways. The weakly bound acetonitrile ligand in the initially obtained trans-[PdBr2(MeCN)(Pyry)] complex (6, Pyry = 1-phenyl-2,3-dimethylpyrazolin-5-ylidene) could be replaced by other donor ligands, and additional NHC ligands were introduced either by silver carbene
已经通过氧化加成和银卡宾转移途径合成了十个带有吡唑啉-5-亚烷基配体的钯(II)配合物。最初获得的反式-[PdBr 2(MeCN)(Pyry)]配合物(6,Pyry = 1-苯基-2,3-二甲基吡唑啉-5-亚烷基)中的弱结合乙腈配体可以被其他供体配体取代,并且通过卡宾银转移反应或通过与原位生成的游离卡宾的反应,可以引入其他NHC配体。使用我们先前报告的13基于13 C NMR的电子参数,吡唑啉5-亚烷基配体估计是迄今为止我们规模上最强的供体配体之一。在优化的条件下,将得到的配合物用作催化剂,以中等至良好的产率将五氟苯直接芳基化。
Selective synthesis of fluorinated biaryls by [MCl<sub>2</sub>(PhPEWO-F)] (M = Ni, Pd) catalysed Negishi cross-coupling
作者:Jaime Ponce-de-León、Pablo Espinet
DOI:10.1039/d1cc04915a
日期:——
Selective Negishi cross-coupling of fluorinated aryls with Ni(ii) or Pd(ii) catalysts made easy using a coupling-promoter ligand.
Scope of direct arylation of fluorinated aromatics with aryl sulfonates
作者:Joyce Wei Wei Chang、Eugene Yurong Chia、Christina Li Lin Chai、Jayasree Seayad
DOI:10.1039/c2ob06840k
日期:——
The scope and limitations of direct arylation of fluorinatedaromatics with aryl sulfonates was examined. Pd(OAc)2, in the presence of MePhos and KOAc in THF, efficiently catalyzed the direct arylation of fluoro aromatics with aryl triflates under ambient conditions. Sterically hindered triflates and heteroaryl triflates gave good to excellent yields of the cross coupled products using a modified catalyst