Benzo[b]furan derivatives are of considerable interest because of their widespread occurrence among natural products and their physiological properties.They are also key starting materials for the synthesis of various medical products[1-6].A halogen atom,useally bromo or ido,is often introduced to a given position of an arene or a heterocyclic compound to make them as a blocking group[7–11].Occasionally,it is introduced from the side reactions[12].So,the dehalogenation is an important chemical transformation in organic synthesis and environmental remediation[13-15].