Polystyrene-supported Pd(II) complex-catalysed carboacylation of 2-arylpyridines with alcohols via C-H bond activation under solvent-free conditions

摘要

Polystyrene-supported N,N-dimethylethylenediamine Pd(II) complex C was used as an efficient catalyst for the synthesis of aromatic ketones via ortho-acylation of sp(2) 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 under solvent-free conditions. Furthermore, catalyst C could be easily recovered by simple filtration and reused for five cycles without any significant decrease in its activity.