1: 81 percent / BF3*OEt2 / CH2Cl2 / 1 h / 20 °C 2: 82 percent / aq. HCl / dioxane / 0.67 h / 50 °C 3: 95 percent / pyridine; DMAP / CH2Cl2 / 1 h / 20 °C 4: NaIO4; RuCl3 / acetonitrile; CCl4; H2O / 6 h 5: 36 mg / diethyl ether; methanol; hexane / 0.5 h / 20 °C 6: 92 percent / NaOMe / methanol / 1 h / 20 °C View Scheme