1: NaN3 / acetone; H2O / 12 h / Ambient temperature 2: 95 percent / DBU / tetrahydrofuran / 12 h / Heating 3: 46 percent / CH2Cl2 / 3 h / 150 °C 4: H2 / Pd(OH)2-C / ethyl acetate / 1 h / 3040 Torr / Ambient temperature 5: 85 percent / 48percent HBr / 2 h / Heating View Scheme