1: 98 percent / BF3*Et2O / CH2Cl2 / 2 h / -20 - 20 °C 2: 94 percent / NaHCO3, m-CPBA / CH2Cl2 / 2 h / Ambient temperature 3: 1) n-BuLi / 1) DME, hexane, -50 deg C, 30 min, 2) DME, hexane, -60 deg C, 2 h 4: 68 percent / sodium amalgam, disodium hydrogen phosphate / methanol / 3 h / Ambient temperature 5: 95 percent / Jones reagent / acetone / 0.5 h / Ambient temperature 6: 92 percent / TFA / CH2Cl2 / 0.5 h / Ambient temperature 7: 70 percent / NaBH3CN, AcOH / acetonitrile; H2O / 1.33 h / pH 7 View Scheme