To a flame-dried 5-mL microwave vial with a magnetic stir bar was added oxime 6-12 (50 mg, 0.33 mmol, 1.0 equiv) as a mixture of isomers, and CH2Cl2 (320 µL, 1.0 M). The reaction vessel was moved to a 0 °C ice-water bath, and triethylamine (92 µL, 0.65 mmol, 2.0 equiv) was added dropwise to the reaction mixture. After stirring at 0 °C for 5 minutes, PivCl (45 mg, 0.36 mmol, 1.1 equiv) was added dropwise to the reaction mixture. The reaction vessel was removed from the ice-water bath, and the reaction mixture was allowed to stir at room temperature.