1: 91 percent / NBS / CH2Cl2 / 0.5 h / 20 °C 2: MCPBA, Na2SO4, 4,4'-methylenebis(2,6-di-t-butyl)phenol / benzene / 1 h / 20 °C 3: aq. NaOH / methanol; tetrahydrofuran / 20 °C 4: K2CO3 / dimethylsulfoxide / 16 h / 20 °C 5: TBAF 6: DEAD, PPh3 7: NaOH 9: 1.) t-BuLi, 2.) FeCl3 / 1.) THF, -78 deg, 2.) -78 deg to 20 deg 10: 1.) TBAF, 2.) H2 / 2.) Pd/C / 1.) THF, 2.) THF, MeOH 11: 65 percent / K3Fe(CN)6, NaOH / H2O; ethanol; tetrahydrofuran / 20 °C 12: 54 percent / DMAP, pyridine 13: aq. HCl View Scheme