A practical, efficient palladium\copper cocatalytic system has been developed. With only 1% Pd(OAc)2, 10% CuCl2·2H2O, 0.5 equiv of inexpensive PPh3 as ligand, and K2CO3 as the base, the direct arylation of benzoazoles with aryl bromides could be performed smoothly and afforded the desired arylated benzoazoles in good yields. The cocatalytic system has the property of low catalyst loading, simple ligand, ...