Synthesis of novel 3,5-dichloro-2-arylpyridines by palladium acetate-catalyzed ligand-free Suzuki reactions in aqueous media.

A highly efficient palladium acetate-catalyzed ligand-free Suzuki reaction of 2,3,5-trichloropyridine with arylboronic acids in aqueous phase was developed. High yields of 3,5-dichloro-2-arylpyridines, a simple Pd source, absence of ligands, and environmentally benign as well as mild reaction conditions are important features of this method.