1: TsOH / benzene / 24 h / Heating 2: I2, PPh3, imidazole / toluene / 3 h / Ambient temperature 3: NaHCO3 / acetonitrile / 4 h / Heating 4: 1.) KN(SiMe3)2 / 1.) -78 deg C, 2 h, 2.) THF-HMPA, -78 deg C -> r.t., 16 h 5: Bu4NF / dimethylformamide / 2 h / Ambient temperature 6: 1.) Re2O7, lutidine, 2.) TsOH / 1.) CH2Cl2, 4 h, 2.) dimethoxypropane, acetone, 1 h 7: PPH3, DEAD / benzene / 16 h 9: CH2Cl2 / 1 h / -20 - 0 °C 10: TsOH / methanol; H2O / 16 h / Ambient temperature 11: pyridine / 2 h / 100 °C 12: LiAlH4 / diethyl ether; tetrahydrofuran / 2 h / 0 °C / Heating 14: I2, PPh3, imidazole / CH2Cl2 / 1 h / Ambient temperature 15: NaHCO3 / acetonitrile / 24 h / 45 °C 16: 1.) n-BuLi / 1.) THF, 0 deg C, 0.5 h, 2.) THF, 0 deg C -> room temp., 1 h 17: H2, Rh(PPh3)3Cl / benzene; ethanol / 2 h / Ambient temperature 18: acetyl chloride / methanol; diethyl ether / 6 h / Heating View Scheme