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。
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
Polystyrene-supported Dichloro-(8-aminoquinoline)-Pd(II) complex C was synthesized and its catalytic efficiency was evaluated for ortho-acylation of 2-aryl pyridines with alcohols to form aryl ketones via cross dehydrogenative coupling. In addition in the presence of Pd(II) complex, toluene derivatives were also employed as an effective coupling partner for synthesis of aromatic ketones. Furthermore, this catalyst was highly stable and could be easily recovered by simple filtration and reused for four cycles with no significant decrease in its activity and selectivity. (C) 2016 Elsevier B.V. All rights reserved.
Ruthenium-Catalyzed Carbonylative Coupling of Anilines with Organoboranes by the Cleavage of Neutral Aryl C–N Bond
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.