A palladium-catalyzeddirect access to ketones from aldehydes via C−H cleavage of arenes is described. The procedure utilizes air as a clean and free terminal oxidant.
描述了钯催化经由芳烃的CH裂解从醛类直接通往酮的方法。该程序利用空气作为清洁和游离的终端氧化剂。
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.
Nickel-catalyzed regioselective C–H acylation of chelating arenes: a new catalytic system for C–C bond formation <i>via</i> a radical process and its mechanistic explorations
作者:Ze-lin Li、Peng-yu Wu、Kang-kang Sun、Chun Cai
DOI:10.1039/c9nj02191d
日期:——
ortho C–Hbond of chelating arenes via the Ni(II)-catalyzed cross dehydrogenative coupling strategy has been developed here. This new procedure exhibits excellent regioselectivity and good functional group tolerance. This discovery could be of great importance for the C–H acylation reactions of chelating arenes without any extraneous directing group and for the application of nickel-catalyzed C–H activation
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.
Recyclable Pd(II)complex catalyzed oxidative sp2 CH bond acylation of 2-aryl pyridines with toluene derivatives
作者:Pullaiah C. Perumgani、Sai Prathima Parvathaneni、Srinivas Keesara、Mohan Rao Mandapati
DOI:10.1016/j.jorganchem.2016.08.028
日期:2016.11
complex C was synthesized and characterized using different spectroscopic techniques. In addition the catalytic efficiency of the Pd (II) complex C was evaluated for ortho-acylation of 2-aryl pyridines with toluene derivatives to form aryl ketones via cross dehydrogenative coupling. In this catalytic process toluene acts as an effective coupling partner upon sp3 CH bond oxidation for sp2 CH bond acylation
合成了可回收的聚合物锚定的Pd(II)复合物C,并使用不同的光谱技术对其进行了表征。此外,评估了Pd(II)配合物C的催化效率,用于2-芳基吡啶与甲苯衍生物的正酰化反应,通过交叉脱氢偶联形成芳基酮。在该催化过程中,甲苯在水上存在Pd(II)/ TBHP体系的情况下,在sp 3 C H键氧化作用下,作为2-芳基吡啶的sp 2 C H键酰化反应的有效偶联伙伴。此外,催化剂C 具有很高的稳定性,可以很容易地回收和再利用四个周期,而其活性和选择性却没有明显降低。