4-toluenesulfonyl azide; triethylamine in acetonitrile 20 h; Ambient temperature;

1: 87 percent / AcONa / 0.5 h 2: 68 percent / Et3N, tosyl azide / acetonitrile / 2 h / Ambient temperature View Scheme

1: 82.7 percent / toluene / 10 h / 80 - 100 °C 2: 84.5 percent / triethylamine, p-toluenesulfonyl azide / acetonitrile / 20 h / Ambient temperature View Scheme