1: 80 percent / pyridine / 1.) 0 deg C, 0.5 h, 2.) 20 deg C, 2 h 2: 100 percent / PtO2, hydrogen / ethanol / Ambient temperature 3: 87 percent / 90percent aqueous CF3COOH / 3.5 h / 0 °C 4: 57 percent / lead tetraacetate / CH2Cl2 / 1.25 h / -10 °C 5: 1.) n-BuLi, 2.) HMPA / 1.) THF, hexane, -100 deg C, 2 min, 2.) THF, hexane, from -100 deg C to RT 6: 61 percent / tetra-n-butylammonium fluoride / tetrahydrofuran / 15 h / Ambient temperature 7: potassium carbonate / methanol; H2O / 7.5 h / Ambient temperature 8: AcOH / H2O View Scheme