Ambient temperatureruthenium‐catalyzedC−H arylations were accomplished by visiblelight without additional photocatalysts. The robustness of the ruthenium‐catalyzedC−H functionalization protocol was reflected by a broad range of sensitive functional groups and synthetically useful pyrazoles, triazoles and sensitive nucleosides and nucleotides, as well as multifold C−H functionalizations. Biscyclometalated
Solvent-free ruthenium-catalysed triflate coupling as a convenient method for selective azole-<i>o</i>-C–H monoarylation
作者:Oumaima Abidi、Taoufik Boubaker、Jean-Cyrille Hierso、Julien Roger
DOI:10.1039/c9ob00806c
日期:——
Metal-catalysed ortho-directed C-H functionalization usually faces selectivity issues in the competition between mono- and disubstitution processes. We report herein the ruthenium-catalysed N-directed C-H monoarylation of arylpyrazoles with a selectivity of up to 96% or that generally reaches values above 80%. This selectivity is an effect of solvent-free conditions associated with sulfonate reagents, in the absence
Assisted Ruthenium-Catalyzed C−H Bond Activation: Carboxylic Acids as Cocatalysts for Generally Applicable Direct Arylations in Apolar Solvents
作者:Lutz Ackermann、Rubén Vicente、Andreas Althammer
DOI:10.1021/ol800773x
日期:2008.6.5
Catalytic amounts of aromatic carboxylicacid MesCO H enabled efficient ruthenium-catalyzeddirect arylations in apolar solvents with unparalleled broad scope via a concerted deprotonation-metalation mechanism.
Domino <i>N</i>
-/<i>C</i>
-Arylation via In Situ Generation of a Directing Group: Atom-Efficient Arylation Using Diaryliodonium Salts
作者:Christopher J. Teskey、Shariar M. A. Sohel、Danielle L. Bunting、Sachin G. Modha、Michael F. Greaney
DOI:10.1002/anie.201701523
日期:2017.5.2
Both aryl components of diaryliodonium salts can be used in a domino one‐pot reaction via in situ generation of a directinggroup. A number of heterocycles undergo N‐arylation which is followed by ruthenium‐catalyzed C‐arylation. Notably the reaction extends well to unsymmetrical diaryliodonium salts with a number of highly selective examples shown.
Mechanistic Insight into Direct Arylations with Ruthenium(II) Carboxylate Catalysts
作者:Lutz Ackermann、Rubén Vicente、Harish K. Potukuchi、Valentina Pirovano
DOI:10.1021/ol102187e
日期:2010.11.5
Mechanistic studies revealed ruthenium-catalyzed direct arylations to proceed through reversible C-H bond activation and subsequent rate-limiting oxidative addition with aryl halides, which led to the development of widely applicable well-defined ruthenium(II) carboxylate catalysts.