2: 97 percent / aqueous potassium hydroxide, potassium permanganate / pyridine / 8 h / 95 - 100 °C 3: 98 percent / potassium hydroxide, copper sulfate, zinc dust / 20 h / Heating 4: 1.) acetic anhydride, zinc chloride, 2.) potassium dichromate / 1.) reflux, acetic acid, 2 h, 2.) +H2O, reflux, 1 h 5: dimethyl sulfoxide, sodium hydride 6: LiAlH4 / tetrahydrofuran / 2 h / cooling 7: 96 percent / HCl, SnCl2 8: 84 percent / BBr3 / benzene / 0.75 h / Heating; deoxygenated solvents 9: 85 percent / pyridine / Ambient temperature View Scheme

2: 95 percent View Scheme

2: 90 percent / triethylsilane / trifluoroacetic acid / 48 h / Ambient temperature 3: 85 percent / acetic anhydride, zinc chloride / acetic acid / 2 h / Heating 4: 90 percent / potassium dichromate / acetic acid / 15 h / Heating 5: dimethyl sulfoxide, sodium hydride 6: 80 percent 7: 95 percent View Scheme

2: 90 percent / triethylsilane / trifluoroacetic acid / 48 h / Ambient temperature 3: 85 percent / acetic anhydride, zinc chloride / acetic acid / 2 h / Heating 4: 90 percent / potassium dichromate / acetic acid / 15 h / Heating 5: dimethyl sulfoxide, sodium hydride 6: 80 percent 7: 95 percent 8: 76 percent View Scheme

2: 90 percent / triethylsilane / trifluoroacetic acid / 48 h / Ambient temperature 3: 85 percent / acetic anhydride, zinc chloride / acetic acid / 2 h / Heating 4: 90 percent / potassium dichromate / acetic acid / 15 h / Heating 5: dimethyl sulfoxide, sodium hydride 6: 80 percent 7: 95 percent 8: 76 percent 9: 81 percent View Scheme