Stage #1: With  trifluoroacetic acid T=80°C; 2 h; Stage #2: With  sodium carbonate T=20°C;  Saturated solution;   

Multi-step reaction with 4 steps 1.1: AlCl3, aluminium chloride / 0 °C2.1: triethylamine / tetrahydrofuran / 0.5 h / -10 °C2.2: 1.5 h / -10 °C3.1: sodium azide / tetrahydrofuran; water / 3 h / -10 °C4.1: trifluoroacetic acid / 2 h / 80 °C4.2: 20 °C / Saturated solution