1.1: sodium azide / N,N-dimethyl-formamide / 3 h / 20 °C / Inert atmosphere 2.1: boron trifluoride diethyl etherate / dichloromethane / -78 - 20 °C / Inert atmosphere 2.2: 0 - 20 °C / Inert atmosphere View Scheme

sodium azide in N,N-dimethyl-formamide T=20°C; 3 h; Inert atmosphere;