Efficient Pd(II)-catalyzed regioselective ortho-halogenation of arylcyanamides

Regioselective ortho-halogenation of arylcyanamides using a Pd(II) catalyst has been established under mild reaction conditions. Either electron-donating or electron-withdrawing groups readily carried out the reaction and produced final products in moderate to good yields. Based on the experimental work, we have confirmed that this method does not undergo a free radical mechanism. Furthermore, we have also attempted this method for practical utility purposes.