1: 85 percent / aq. AcOH; TBAF / tetrahydrofuran / 0 - 20 °C 2: Jones reagent / acetone / 0 - 20 °C 3: 466 mg / diethyl ether / 1 h / 20 °C 4: 100 percent / H2 / Pd/C / methanol / 1 h / 20 °C 5: 74 percent / DCC / CH2Cl2 / 12 h / -20 °C 6: 31 percent / 120 h / -196 °C / Photolysis View Scheme