1: BH3, O2 / tetrahydrofuran / 1.) 0 deg C (1.5 h) , 22 deg C (16 h) 2: 1.) LiCO3, 2.) Jones reagent / 1.) dimethylacetamide, 150 deg C, 15 min 3: OsO4, C5H5N / 3 h / 0 °C 4: 74 percent / CF3CO3H / CH2Cl2 / 1 h / 22 °C View Scheme