Direct Carbo-Acylation Reactions of 2-Arylpyridines with α-Diketones via Pd-Catalyzed C–H Activation and Selective C(sp2)–C(sp2) Cleavage
摘要:
An efficient carbo-acylation reaction of 2-arylpyridines with alpha-diketones via Pd-catalyzed C-H bond activation and C-C bond cleavage in the presence of TBHP was developed that generated aryl ketones in good yields. The highly selective formation of aryl ketones was observed when 2-arylpyridines reacted with aromatic/aliphatic alpha-diketones.
Manganese-Catalyzed Direct Nucleophilic C(sp<sup>2</sup>)H Addition to Aldehydes and Nitriles
作者:Bingwei Zhou、Yuanyuan Hu、Congyang Wang
DOI:10.1002/anie.201506187
日期:2015.11.9
Herein, a manganese‐catalyzed nucleophilicaddition of inert C(sp2)H bonds to aldehydes and nitriles is disclosed by virtue of a dual activation strategy. The reactions feature mild reaction conditions, excellent regio‐ and stereoselectivity, and a wide substrate scope, which includes both aromatic and olefinic CH bonds, as well as a large variety of aldehydes and nitriles. Moreover, mechanistic studies
Palladium-catalyzed decarboxylative, decarbonylative and dehydrogenative C(sp<sup>2</sup>)–H acylation at room temperature
作者:Asik Hossian、Manash Kumar Manna、Kartic Manna、Ranjan Jana
DOI:10.1039/c7ob01466j
日期:——
ambient temperature. A novel decarbonylative C–H acylation reaction has also been accomplished using aryl glyoxals as acyl surrogates. Finally, a practical C–H acylation via a dehydrogenative pathway has been demonstrated using commercially available benzaldehydes and aqueous hydroperoxides. We also disclose that acetonitrile solvent is optimal for the acylation reaction at room temperature and has a prominent
Decarboxylative acylation of arenes with mandelic acid derivatives via palladium-catalyzed oxidative sp<sup>2</sup> C–H activation
作者:Xia Liu、Ze Yi、Jianhui Wang、Guiyan Liu
DOI:10.1039/c4ra14107e
日期:——
An efficient palladium catalyzed decarboxylative acylation of arenes with mandelic acid derivatives via oxidative sp2 C–H activation in the presence of tert-butyl hydroperoxide has been developed. The acylation reaction is assisted by a pyridine directing group. The starting materials are inexpensive and readily available. This method provides an economical and convenient way to synthesize aryl ketones
Decarboxylative Acylation of Arenes with α-Oxocarboxylic Acids via Palladium-Catalyzed C−H Activation
作者:Mingzong Li、Haibo Ge
DOI:10.1021/ol1012857
日期:2010.8.6
An efficient palladium-catalyzeddecarboxylative acylation of unactivated arenes with α-oxocarboxylic acids is reported. This method provides a novel access to aryl ketones.
报道了未活化的芳烃与α-氧代羧酸的有效的钯催化的脱羧酰化。该方法为芳基酮提供了一种新颖的途径。
Dual Photoredox/Palladium-Catalyzed C–H Acylation of 2-Arylpyridines with Oxime Esters
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