1.1: phosphorus pentachloride / dichloromethane / 3.5 h / 0 °C 2.1: hydrogen; palladium on activated charcoal / ethyl acetate / 15 h / 20 °C 3.1: tert.-butyl lithium / tetrahydrofuran; pentane / 1.83 h / -78 °C 3.2: 19 h / -78 °C 4.1: hydrogen; palladium on activated charcoal / methanol / 67 h / 2947.82 Torr 5.1: triethylamine / dichloromethane / 2 h / -10 - 0 °C 6.1: lithium bromide / tetrahydrofuran / 23 h / |Reflux 7.1: sodium azide / N,N-dimethyl-formamide / 48 h / 90 °C View Scheme