1: CH2Cl2 / 1.5 h / 0 - 20 °C 2: H2O / acetone / 1 h / 20 °C View Scheme

1: CH2Cl2 / 1.5 h / 0 - 20 °C 2: H2O / acetone / 1 h / 20 °C 3: 99 percent / (CH3)2NSF3 / CHCl3 / 0.33 h / 0 - 20 °C 4: 96 percent / Et3N / diethyl ether / 1 h / 0 °C View Scheme