sodium azide in N,N-dimethyl-formamide T=120°C; 24 h;

trimethylsilylazide; N,N-diethyl carbamoyl chloride in acetonitrile 24 h; Heating;

1: 63 percent / 87 percent m-chloroperbenzoic acid / CHCl3 / 3 h / 45 - 50 °C 2: 67 percent / trimethylsilyl azide, diethylcarbamoyl chloride / acetonitrile / 24 h / Heating View Scheme

T=220°C;