1: 31 percent / NaBH3CN / acetic acid / 1 h / 50 °C / before heating 2 h, after heating 23 h room temperature 2: 83 percent / NaOEt / toluene / 5 h 3: 87 percent / hydrogen / Raney Ni / aq. NH3; aq. ethanol / 14 h / 2585.7 Torr 4: 88 percent / NaOH / aq. ethanol / 264 h / 55 °C 5: 68 percent / (+/-)-trans-2-(butylsulfonyl)-3-phenyloxaziridine / CH2Cl2 / 0.67 h View Scheme