1: pyridinium chlorochromate / dichloromethane 3: mild base 4: triethylamine / dichloromethane 5: Heating 6: water / Acidic conditions View Scheme

2: mild base 3: triethylamine / dichloromethane 4: Heating 5: water / Acidic conditions View Scheme

1: mild base 2: triethylamine / dichloromethane 3: Heating 4: water / Acidic conditions View Scheme

1: triethylamine / dichloromethane 2: Heating 3: water / Acidic conditions View Scheme

1.1: sodium hydride / tetrahydrofuran; mineral oil / 0.02 h / 20 °C / Inert atmosphere 1.2: 1 h / Inert atmosphere 2.1: boron trifluoride diethyl etherate / dichloromethane / 0.17 h / -78 °C / Inert atmosphere 2.2: 2.33 h / -78 - 20 °C / Inert atmosphere 3.1: [RhCl(η2:η2-cycloocta-1,5-diene)]2; tri-p-tolyl phosphite / tetrahydrofuran / 36 h / 135 °C / Inert atmosphere; sealed-tube 4.1: dipyridinium dichromate; N,N-dimethyl-formamide / 16 h / 20 °C / Inert atmosphere 5.1: sodium / 2.16 h / 0 - 20 °C / Inert atmosphere 6.1: Jone's reagent / water; acetone / 4.08 h / 0 °C / Inert atmosphere 7.1: lithium hydroxide hydrate / propan-1-ol; water / 12 h / 120 °C / Inert atmosphere 7.2: Dowex-50WX8 (H+ form) / Inert atmosphere View Scheme

1.1: boron trifluoride diethyl etherate / dichloromethane / 0.17 h / -78 °C / Inert atmosphere 1.2: 2.33 h / -78 - 20 °C / Inert atmosphere 2.1: [RhCl(η2:η2-cycloocta-1,5-diene)]2; tri-p-tolyl phosphite / tetrahydrofuran / 36 h / 135 °C / Inert atmosphere; sealed-tube 3.1: dipyridinium dichromate; N,N-dimethyl-formamide / 16 h / 20 °C / Inert atmosphere 4.1: sodium / 2.16 h / 0 - 20 °C / Inert atmosphere 5.1: Jone's reagent / water; acetone / 4.08 h / 0 °C / Inert atmosphere 6.1: lithium hydroxide hydrate / propan-1-ol; water / 12 h / 120 °C / Inert atmosphere 6.2: Dowex-50WX8 (H+ form) / Inert atmosphere View Scheme

1.1: [RhCl(η2:η2-cycloocta-1,5-diene)]2; tri-p-tolyl phosphite / tetrahydrofuran / 36 h / 135 °C / Inert atmosphere; sealed-tube 2.1: dipyridinium dichromate; N,N-dimethyl-formamide / 16 h / 20 °C / Inert atmosphere 3.1: sodium / 2.16 h / 0 - 20 °C / Inert atmosphere 4.1: Jone's reagent / water; acetone / 4.08 h / 0 °C / Inert atmosphere 5.1: lithium hydroxide hydrate / propan-1-ol; water / 12 h / 120 °C / Inert atmosphere 5.2: Dowex-50WX8 (H+ form) / Inert atmosphere View Scheme

1.1: dipyridinium dichromate; N,N-dimethyl-formamide / 16 h / 20 °C / Inert atmosphere 2.1: sodium / 2.16 h / 0 - 20 °C / Inert atmosphere 3.1: Jone's reagent / water; acetone / 4.08 h / 0 °C / Inert atmosphere 4.1: lithium hydroxide hydrate / propan-1-ol; water / 12 h / 120 °C / Inert atmosphere 4.2: Dowex-50WX8 (H+ form) / Inert atmosphere View Scheme

1.1: potassium hydrogensulfate / tetrahydrofuran / Inert atmosphere 2.1: lithium hydroxide hydrate / tetrahydrofuran / 1.5 h / Inert atmosphere 3.1: pyridine / toluene / 2.5 h / Inert atmosphere; Reflux 4.1: diethyl ether / 0.33 h / 0 °C / Inert atmosphere 5.1: 1,8-diazabicyclo[5.4.0]undec-7-ene / dichloromethane / 4 h / 20 °C / Inert atmosphere 6.1: Cu(I)CN / tetrahydrofuran / 0.5 h / -78 °C / Inert atmosphere 6.2: 0.75 h / -78 °C / Inert atmosphere 7.1: dimethylsulfide; oxygen; ozone / methanol; dichloromethane / 2 h / -116 - 20 °C / Inert atmosphere 8.1: diethyl ether / 0 °C / Inert atmosphere 9.1: potassium hexamethylsilazane / tetrahydrofuran / 0.25 h / -78 °C / Inert atmosphere 9.2: 1.5 h / -78 - 0 °C / Inert atmosphere 10.1: triethylsilane; tetrakis(triphenylphosphine) palladium(0); lithium chloride / N,N-dimethyl-formamide / 2 h / 55 °C / Inert atmosphere 11.1: lithium hydroxide hydrate / tetrahydrofuran / 10 h / 0 - 20 °C / Inert atmosphere 12.1: trifluoroacetic acid / tetrahydrofuran; dichloromethane / 10 h / Inert atmosphere View Scheme

1.1: naphthalenyllithium / tetrahydrofuran / 0 °C 2.1: Jone's reagent / acetone / 0.5 h / 0 °C 2.2: 3 h / 20 °C View Scheme