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.
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 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.
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
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。
Ruthenium-Catalyzed Carbonylative CC Coupling in Water by Directed CH Bond Activation
arenes bearing ortho‐directing groups (DG) in the presence of a ruthenium catalyst and aryl iodide is presented. The reaction is general for variously substituted aryl iodides to giveketones in moderate to good yields, and water serves as the solvent. The system is highly selective towards the mono‐carbonylativearylation by ortho CH functionalization. cod=cyclo‐1,5‐octadiene.