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.
Pd/Mg–La mixed oxide catalyzed oxidative sp2 CH bond acylation with alcohols
Pd/Mg-La mixed oxide is used as an efficient catalyst for the oxidative direct acylation of arene sp(2) C-H bonds with alcohols. TBHP was used for in situ oxidation of the alcohols to aldehydes which after coupling with 2-aryl pyridines forms aryl ketones. The catalyst is recovered and used for four cycles. (C) 2013 Elsevier B.V. All rights reserved.