1: 70 percent / molecular sieves, NMO, TPAP / CH2Cl2 / 2 h / Ambient temperature 2: 88 percent / CF3CO2H / CH2Cl2 / 10 h / -55 °C 3: 1.) BH3, 2.) 6 N NaOH, H2O2 / 1.) THF, room temperature, 2 h, 2.) EtOH, H2O, 55 deg C, 1.5 h 4: 97 percent / molecular sieves, NMO, TPAP / CH2Cl2 / 1 h View Scheme