more economically attractive but usually much more difficult as substrates in metal-mediated couplings than the corresponding bromides and iodides. A catalyst prepared from a bulky (biaryl)diphenyl phosphane and a common ruthenium source (1:1) mediates selective direct monoarylations of arenes bearing 2-pyridyl and related ortho-directing groups in good yields. Sequential arylations to heterodiarylated
One-pot direct C–H arylation of arenes in water catalysed by RuCl3·nH2O–NaOAc in the presence of Zn
作者:Luis A. Adrio、José Gimeno、Cristian Vicent
DOI:10.1039/c3cc43452d
日期:——
The inexpensive and commercially available catalytic system RuCl3·nH2OâNaOAcâZn is active in water for the direct CâH arylation of arenes with aryl/heteroaryl chlorides. The reaction can be accelerated by the use of microwave irradiation and can also be scaled up to a multi-gram scale with excellent isolated yields.
Palladium-Catalyzed Decarboxylative Arylation of C−H Bonds by Aryl Acylperoxides
作者:Wing-Yiu Yu、Wing Nga Sit、Zhongyuan Zhou、Albert S.-C. Chan
DOI:10.1021/ol900756g
日期:2009.8.6
bond was developed using aryl acylperoxides as inexpensive aryl sources. Substrates containing pyridyl, oxime, and oxazoline groups undergo effectively ortho-selective C−H arylation with excellent functional group tolerance. This arylation should begin by directing-group-assisted cyclopalladation, followed by the reaction of the palladacycle with aryl radicals generated in situ by thermal decomposition
Pyridine-directed carbon–carbon single bond activation: Rhodium-catalyzed decarbonylation of aryl and heteroaromatic ketones
作者:Cole J. Wagner、Eric A. Salisbury、Erik J. Schoonover、Jacob P. VanderRoest、Jeffrey B. Johnson
DOI:10.1016/j.tetlet.2021.153132
日期:2021.6
The decarbonylation of 2-pyridyl-substituted ketones via transition metal-catalyzed carbon–carbonbondactivation provides ready access to a variety of biaryl compounds. The highly efficient and general method provides reliable decarbonylation of benzophenones including a range of functional groups and substitution patterns. The methodology has also proven highly efficient for heteroaromatic substrates