Palladium catalyzed direct ortho C–H acylation of 2-arylpyridines using toluene derivatives as acylation reagents
作者:Zhipeng Xu、Biao Xiang、Peipei Sun
DOI:10.1039/c2ra22208f
日期:——
A facile ortho-acylation of 2-arylpyridines by a Pd-catalyzed oxidative CâH activation was developed, in which no prefunctionalized toluene derivatives were used as acylation reagents in a tandem reaction to form 2-pyridyldiaryl ketones with moderate yields.
Palladium-Catalyzed Oxidative Synthesis of Aromatic Ketones Using Olefins as Acyl Equivalents through Selective<i>ortho</i>Aromatic C-H Bond Activation
作者:Ashok B. Khemnar、Bhalchandra M. Bhanage
DOI:10.1002/ejoc.201402782
日期:2014.10
selective ortho-acylation of arenes by oxidative C–H bond activation using a palladium catalyst. Olefins were oxidized to the corresponding aldehydes/benzoyl radicals, which, on coupling with 2-phenylpyridine, gave the corresponding acylated products in good to excellent yields. 1-Phenylpyrazole also reacts with substituted olefins to give the acylation products in good yields.
An acylation of arenes with aldehydesthrough dual C–H activations at room temperature is reported. The acylation was initiated by phenanthraquinone-catalyzed hydrogen atom transfer from aldehyde under visible light irradiation. The aldehyde-derived acyl radical merged with palladium-catalyzed activation of arenes to afford the cross coupling products.