1: Dess-Martin periodinane; PhCO2H / CH2Cl2; dimethylsulfoxide / 0.5 h 2: 4.4 g / CH2Cl2; dimethylsulfoxide / 10 h / 20 °C 3: 78 percent / DIBAL-H / CH2Cl2; hexane / 0 - 20 °C 4: 80 percent / TBAF / tetrahydrofuran / 3 h / 20 °C 5: 65 percent / (+)-DET; Ti(OPr-i)4; TBHP / 4 h / -20 °C 6: 82 percent / pyridine / CH2Cl2 / 10 h / 20 °C View Scheme

1: Dess-Martin periodinane; PhCO2H / CH2Cl2; dimethylsulfoxide / 0.5 h 2: 4.4 g / CH2Cl2; dimethylsulfoxide / 10 h / 20 °C 3: 78 percent / DIBAL-H / CH2Cl2; hexane / 0 - 20 °C 4: 80 percent / TBAF / tetrahydrofuran / 3 h / 20 °C 5: 65 percent / (+)-DET; Ti(OPr-i)4; TBHP / 4 h / -20 °C View Scheme

1: Dess-Martin periodinane; PhCO2H / CH2Cl2; dimethylsulfoxide / 0.5 h 2: 4.4 g / CH2Cl2; dimethylsulfoxide / 10 h / 20 °C 3: 78 percent / DIBAL-H / CH2Cl2; hexane / 0 - 20 °C 4: 80 percent / TBAF / tetrahydrofuran / 3 h / 20 °C 5: 65 percent / (-)-DET; Ti(OPr-i)4; TBHP / 4 h / -20 °C 6: 61 percent / DEAD; TPP / tetrahydrofuran / -20 - 20 °C 7: 72 percent / NaOMe / methanol / 3 h / 20 °C 8: 75 percent / pyridine / CH2Cl2 / 10 h / 20 °C View Scheme