General experimental procedure for preparing cisaziridines (e.g., 12) 3 (40.7 mg, 0.2 mmol, 1.0 equiv) and chloroacetic acid (5.7 mg, 0.06 mmol, 30 mol%) were added to a dry microwave vial, which was capped, purged, and filled with N2. PhMe (500 μL, 0.4 M) was added, and the mixture was stirred at 40 °C for 15 min prior to the addition of aniline (24 μL, 0.26 mmol, 1.3 equiv). The reaction was stirred at 40 °C for 16 h, before being quenched by the addition of saturated NaHCO3 solution. The mixture was extracted with EtOAc, dried over Na2SO4, filtered, and concentrated under reduced pressure.