To a flame-dried 5-mL microwave vial equipped with a magnetic stir bar was added benzene sulfinic acid sodium salt (30.0 mg, 0.185 and.0 equiv). The reaction vial was sealed with a Teflon-coated silicon microwave cap, and the DMF (0.12 mL, 1.0 M) was added to the reaction mixture. The reaction vessel was then transferred to a 45 °C preheated oil bath.