Chlorothalonil 1 was treated with anhydrous KF in DMF at 110 ℃ to give the corresponding crystalline fluorine-containing 1,3-benzenedicarbonitrile 2. KF was used in an equivalent to the number of chlorine atoms to be substituted. Compound 2 was subsequently reacted with ammonia to yield compound 3. In addition, halobenzamide 4 were refluxed with oxalyl chloride in anhydrous 1,2-dichloroethane(DCE) to yield benzoylisocyanates 5. Finally, seven novel BPUs chitin inhibitors 6a—6g were synthesized via the selective reaction of compound 3 with benzoylisocyanate derivatives 5, the total yield is over 30%—50%.
