1: 97 percent / dimethylsulfoxide / 12 h / 40 °C 2: 96 percent / CrO3, H2SO4 / acetone / 0 °C 3: 89 percent / 6 M aq. NaOH / methanol / 1 h / Heating 4: tetrahydrofuran; diethyl ether / 1.) -70 deg C, 1 h, 2.) 0 deg C, 30 min 5: p-TsOH*H2O / toluene / 0.5 h / Heating 6: 76 percent / LiAlH4 / diethyl ether / 0.5 h / Ambient temperature 7: 45 percent / p-TsOH*H2O / nitromethane / 0.08 h / 40 °C View Scheme