1: hydrogen; palladium on activated charcoal / methanol / 67 h / 2947.82 Torr 2: triethylamine / dichloromethane / 2 h / -10 - 0 °C 3: lithium bromide / tetrahydrofuran / 23 h / |Reflux 4: sodium azide / N,N-dimethyl-formamide / 48 h / 90 °C View Scheme