1.1: sulfuric acid / 120 - 125 °C / Inert atmosphere 2.1: potassium carbonate / acetone / Reflux 3.1: potassium hydroxide; water / methanol / Inert atmosphere; Reflux 3.2: pH 1 - 2 4.1: toluene / 0 - 10 °C 4.2: 50 - 60 °C 5.1: sodium tetrahydroborate; boron trifluoride diethyl etherate / tetrahydrofuran / 31 - 35 °C 5.2: 30 - 65 °C 6.1: isopropyl alcohol; water / Reflux 7.1: sodium carbonate / dichloromethane; water 7.2: 14 - 20 °C 8.1: hydrogenchloride; sodium tetrahydroborate / water / 32 - 38 °C 8.2: Reflux 9.1: sodium hydroxide; sodium carbonate / dichloromethane; water 9.2: Raney nickel 10.1: triethylamine / dichloromethane / 0.75 h / 0 - 20 °C View Scheme

1.1: isopropyl alcohol; water / Reflux 2.1: sodium carbonate / dichloromethane; water 2.2: 14 - 20 °C 3.1: hydrogenchloride; sodium tetrahydroborate / water / 32 - 38 °C 3.2: Reflux 4.1: sodium hydroxide; sodium carbonate / dichloromethane; water 4.2: Raney nickel 5.1: triethylamine / dichloromethane / 0.75 h / 0 - 20 °C View Scheme

1.1: potassium hydroxide; water / methanol / Inert atmosphere; Reflux 1.2: pH 1 - 2 2.1: toluene / 0 - 10 °C 2.2: 50 - 60 °C 3.1: sodium tetrahydroborate; boron trifluoride diethyl etherate / tetrahydrofuran / 31 - 35 °C 3.2: 30 - 65 °C 4.1: isopropyl alcohol; water / Reflux 5.1: sodium carbonate / dichloromethane; water 5.2: 14 - 20 °C 6.1: hydrogenchloride; sodium tetrahydroborate / water / 32 - 38 °C 6.2: Reflux 7.1: sodium hydroxide; sodium carbonate / dichloromethane; water 7.2: Raney nickel 8.1: triethylamine / dichloromethane / 0.75 h / 0 - 20 °C View Scheme

1.1: hydrogenchloride; sodium tetrahydroborate / water / 32 - 38 °C 1.2: Reflux 2.1: sodium hydroxide; sodium carbonate / dichloromethane; water 2.2: Raney nickel 3.1: triethylamine / dichloromethane / 0.75 h / 0 - 20 °C View Scheme

1.1: sodium tetrahydroborate; boron trifluoride diethyl etherate / tetrahydrofuran / 31 - 35 °C 1.2: 30 - 65 °C 2.1: isopropyl alcohol; water / Reflux 3.1: sodium carbonate / dichloromethane; water 3.2: 14 - 20 °C 4.1: hydrogenchloride; sodium tetrahydroborate / water / 32 - 38 °C 4.2: Reflux 5.1: sodium hydroxide; sodium carbonate / dichloromethane; water 5.2: Raney nickel 6.1: triethylamine / dichloromethane / 0.75 h / 0 - 20 °C View Scheme

1: triethylamine / dichloromethane / 10 - 25 °C 2: dimethylsulfide borane complex / tetrahydrofuran / 10 - 25 °C View Scheme

1.1: potassium hydroxide; water / methanol / |Reflux 1.2: pH 7-8 2.1: triethylamine / dichloromethane / 10 - 25 °C 3.1: dimethylsulfide borane complex / tetrahydrofuran / 10 - 25 °C View Scheme