p-NO2-benzenesulfonyl azide; N-ethyl-N,N-diisopropylamine in acetonitrile T=-10 - 20°C;

1: 90 percent / potassium carbonate; sodium iodide / acetone / 12 h / Heating 2: 95 percent / m-CPBA / CH2Cl2 / 0 - 20 °C 3: 70 percent / p-nitrophenylsulfonylazide; ethyldiisopropylamine / acetonitrile / -10 - 20 °C View Scheme

1: 95 percent / m-CPBA / CH2Cl2 / 0 - 20 °C 2: 70 percent / p-nitrophenylsulfonylazide; ethyldiisopropylamine / acetonitrile / -10 - 20 °C View Scheme