1.1: H2 / PtO2 / ethanol / 1.5 h / 20 °C / 760.05 Torr 2.1: TMSOTf; 4 Angstroem MS / CH2Cl2 / 0.08 h / 20 °C 3.1: TMSOTf / acetonitrile / 17.5 h / -20 °C 4.1: 76 percent / m-CPBA / CH2Cl2 / 18.5 h / 20 °C 5.1: 69 percent / KOH / methanol / 32.5 h / Heating 6.1: Dess-Martin periodinane / CH2Cl2 / 4 h / 20 °C 6.2: 73 percent / triethylsilane; TMSOTf / acetonitrile / 0.25 h / 0 °C 7.1: 81 percent / aq. HCl / 2 h / Heating View Scheme