Ruthenium-Catalyzed Carbonylative Coupling of Anilines with Organoboranes by the Cleavage of Neutral Aryl C–N Bond
摘要:
Herein, we report the first ruthenium-catalyzed Suzuki-type carbonylative reaction of electronically neutral anilines via C(aryl)-N bond cleavage. Without any ligand and base, diaryl ketones can be obtained in moderate to high yields by using Ru-3(CO)(12) as the catalyst and chelation assisted by pyridine. The pyridine ring has a significant effect on both high efficiency and high regioselectivity in the cleavage of the aryl C-N bond in anilines.
unprecedented dual photoredox/palladium-catalyzed iminyl-radical-mediated C–C bond cleavage and directed ortho C–H acylation of 2-arylpyridines by using oxime esters is described. Oxime esters can serve as efficient acyl sources through formation of the corresponding acylradicals by photoredox-catalyzed iminyl-radical-mediated C–C bond cleavage. This redox-neutral protocol features excellent regioselectivity
Palladium-Catalyzed Synthesis of Aromatic Ketones and Isoindolobenzimidazoles<i>via</i>Selective Aromatic CH Bond Acylation
作者:Juyou Lu、Hao Zhang、Xiaowu Chen、Hongxia Liu、Yuyang Jiang、Hua Fu
DOI:10.1002/adsc.201200743
日期:2013.1.9
A convenient and efficient palladium-catalyzed synthesis of aromatic ketones and isoindolobenzimidazoles has been developed via selective aromatic CH bond acylation. The protocol uses palladium acetate as the catalyst, readily available carboxylicacids as the acylating reagents, trifluoroacetic anhydride as the activated agent of the acids, and the corresponding aromatic ketones and isoindolobenzimidazoles
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.
Supported palladium nanoparticles are used as efficient catalysts for the synthesis of aromatic ketones via cross dehydrogenative coupling reactions of 2-arylpyridines with alkylbenzenes.