To a flame dried 20-mL microwave vial equipped with a magnetic stir bar was added oxime and). To the reaction mixture was added Nbromosuccinimide (748 mg, 4.2 mmol, 1.2 equiv), and AIBN (57.5 mg, 0.350 mmol, 0.1 equiv). The microwave vial was sealed with a Teflon microwave cap and the reaction vessel was transferred to an oil bath, which was then heated to 70 °C.