1: 88 percent / dimethylformamide; H2O / 20 h / 50 °C 2: 95 percent / triethylamine / CH2Cl2 / 6 h / 20 °C 3: tetrahydrofuran / 0 - 20 °C 4: 1.83 g / NaOH; H2O2 / H2O; ethanol; tetrahydrofuran / 1 h / 20 °C 5: 96 percent / Dess-Martin periodinane / CH2Cl2 / 0.25 h / 20 °C 6: 82 percent / tetrahydrofuran / 13 h / 65 °C 7: HCl / propan-2-ol / 3 h / 60 °C View Scheme