1: 88 percent / imidazole / dimethylformamide / 24 h / Ambient temperature 2: 81 percent / aq. NaOH / methanol / 10 h / Heating 3: 26 percent / H2O2, aq. NaOH / methanol / 12 h 4: 1.00 g / pyridinium chlorochromate, NaOAc 5: 59 percent / Bu4NF / tetrahydrofuran / 5 h 6: 90 percent / pyridinium chlorochromate, NaOAc 7: 3 percent / H2SO4 / acetone; H2O / 72 h View Scheme