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.
activation of C–H bonds is very important for the construction of a variety of biologically active molecules. Supported alloy nanoparticles are of great interest in various catalytic applications due to the synergistic effects between different metals. Here, well-dispersed CuPd alloy nanoparticles supported on reduced grapheneoxide (rGO) were synthesized and found to be highlyefficient and recyclable
Ag1Pd1 nanoparticle-reduced graphene oxide (Ag1Pd1-rGO) nanocomposite was used as an efficient catalyst for the synthesis of aromaticketones via cross dehydrogenative coupling (CDC) reactions of 2-arylpyridines with aldehydes. The catalyst can be reused for 5 cycles without significantly losing its catalytic activity. On the basis of the obtained experimental evidence, we proposed a possible mechanism
Ag 1 Pd 1纳米粒子还原的氧化石墨烯(Ag 1 Pd 1 -rGO)纳米复合材料被用作通过2-芳基吡啶与醛的交叉脱氢偶联(CDC)反应合成芳族酮的有效催化剂。催化剂可重复使用5个循环,而不会明显丧失其催化活性。在获得的实验证据的基础上,我们提出了一种多相催化的可能机制。我们发现,负载型催化剂表现出一系列好处,包括非凡的催化活性,高可重复使用性和对各种底物的显着耐受性。
Polystyrene-supported Pd(II) complex-catalysed carboacylation of 2-arylpyridines with alcohols via C─H bond activation under solvent-free conditions
作者:Pullaiah C. Perumgani、Sai Prathima Parvathaneni、Srinivas Keesara、Mohan Rao Mandapati
DOI:10.1002/aoc.3581
日期:2017.3
was used as an efficientcatalyst for the synthesis of aromatic ketones via ortho‐acylation of sp2 C─H bonds of 2‐arylpyridines with alcohols as effective coupling partners. The alcohols were oxidized with tert‐butyl hydroperoxide to their corresponding aldehydes in situ and efficiently coupled with 2‐arylpyridines to form aryl ketones undersolvent‐free conditions. Furthermore, catalyst C could be easily