1: 85 percent / HBr / acetic acid / 20 h 2: MgSO4 / CH2Cl2 3: NaB(CN)H3 / tetrahydrofuran; H2O / 3 h / Ambient temperature 4: PVP / CH2Cl2 / 0 °C 5: NaN3 / acetone; H2O / Ambient temperature 6: 95 percent / DBU / tetrahydrofuran / 12 h / Heating 7: 78 percent / CH2Cl2 / 3 h / 150 °C 8: 95 percent / H2 / Pd(OH)2/C / ethyl acetate / 1 h / 3040 Torr / Ambient temperature 9: 85 percent / 46percent aq. HBr / 2 h / Heating View Scheme