1.1: 84 percent / imidazole / CH2Cl2 / 10 h / 20 °C 2.1: BH3*DMS / tetrahydrofuran / 1.5 h / 10 °C 2.2: 75 percent / 30 percent H2O2 / 2 h / 0 °C 3.1: Dess-Martin periodinane; PhCO2H / CH2Cl2; dimethylsulfoxide / 0.5 h 4.1: 4.4 g / CH2Cl2; dimethylsulfoxide / 10 h / 20 °C 5.1: 78 percent / DIBAL-H / CH2Cl2; hexane / 0 - 20 °C 6.1: 80 percent / TBAF / tetrahydrofuran / 3 h / 20 °C 7.1: 65 percent / (+)-DET; Ti(OPr-i)4; TBHP / 4 h / -20 °C 8.1: 82 percent / pyridine / CH2Cl2 / 10 h / 20 °C View Scheme

1.1: 84 percent / imidazole / CH2Cl2 / 10 h / 20 °C 2.1: BH3*DMS / tetrahydrofuran / 1.5 h / 10 °C 2.2: 75 percent / 30 percent H2O2 / 2 h / 0 °C 3.1: Dess-Martin periodinane; PhCO2H / CH2Cl2; dimethylsulfoxide / 0.5 h 4.1: 4.4 g / CH2Cl2; dimethylsulfoxide / 10 h / 20 °C 5.1: 78 percent / DIBAL-H / CH2Cl2; hexane / 0 - 20 °C 6.1: 80 percent / TBAF / tetrahydrofuran / 3 h / 20 °C 7.1: 65 percent / (+)-DET; Ti(OPr-i)4; TBHP / 4 h / -20 °C View Scheme

1.1: 84 percent / imidazole / CH2Cl2 / 10 h / 20 °C 2.1: BH3*DMS / tetrahydrofuran / 1.5 h / 10 °C 2.2: 75 percent / 30 percent H2O2 / 2 h / 0 °C 3.1: Dess-Martin periodinane; PhCO2H / CH2Cl2; dimethylsulfoxide / 0.5 h 4.1: 4.4 g / CH2Cl2; dimethylsulfoxide / 10 h / 20 °C 5.1: 78 percent / DIBAL-H / CH2Cl2; hexane / 0 - 20 °C 6.1: 80 percent / TBAF / tetrahydrofuran / 3 h / 20 °C 7.1: 65 percent / (-)-DET; Ti(OPr-i)4; TBHP / 4 h / -20 °C 8.1: 61 percent / DEAD; TPP / tetrahydrofuran / -20 - 20 °C 9.1: 72 percent / NaOMe / methanol / 3 h / 20 °C 10.1: 75 percent / pyridine / CH2Cl2 / 10 h / 20 °C View Scheme