1: 83 percent / methanol 2: 82 percent / 4 h / 80 °C 3: 2) Dowex 1X8, chloride form / 1) methanol, 15 h, room temperature, sealed tube, 2) water View Scheme

1: 80 percent / dimethylformamide 2: 77 percent / 4 h / 80 °C 3: 2) Dowex 1X8, chloride form / 1) methanol, 6 d, -15 deg C, 2) water View Scheme

1: 95 percent / dimethylformamide / 24 h / Ambient temperature 2: 61 percent / sodium methoxide / methanol / 5 h / Ambient temperature 3: manganese dioxide / CH2Cl2 / 72 h / Ambient temperature 4: pyridinium bromide perbromide / acetic acid / 0.5 h / 80 °C 5: dioxane / 2 h / Ambient temperature 6: 4 h / 80 °C 7: 1) methanol, 15 h, room temperature, sealed tube, 2) water View Scheme