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.
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。
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.
Ruthenium-catalyzed ortho-selective acylation of arylpyridines with acyl chlorides via C–H bond cleavage is described. Aromatic acyl chlorides as well as α,β-unsaturated acyl chlorides were coupled with arylpyridines to give aromatic ketones in the presence of [RuCl2(PPh3)3] as a catalyst and potassium carbonate as a base.
Four Tandem C–H Activations: A Sequential C–C and C–O Bond Making via a Pd-Catalyzed Cross Dehydrogenative Coupling (CDC) Approach
作者:Srimanta Guin、Saroj Kumar Rout、Arghya Banerjee、Shyamapada Nandi、Bhisma K. Patel
DOI:10.1021/ol302438z
日期:2012.10.19
the ortho C–H bond with respect to a directing group has been accomplished via a Pd(II)-catalyzed cross dehydrogenative coupling approach using alkylbenzene as the synthetic equivalent of an aroyl moiety. The reaction proceeds through sequential C–C and C–O bond making at the expense of four consecutive C–H bondcleavages (three sp3 benzylic C–H’s and one sp2 arene C–H) to selectively install an aroyl