1: hydrogenchloride; water / methanol / 2 h / 20 °C 2: potassium hydroxide / ethanol; water / 12 h / Reflux 3: pyridine / 20 °C 4: sodium hydride / tetrahydrofuran; mineral oil / 2 h / 20 °C 5: lithium aluminium tetrahydride / tetrahydrofuran / 2 h / Inert atmosphere; Reflux 6: boron trichloride / dichloromethane / -78 - 20 °C / Inert atmosphere View Scheme

1: hydrogenchloride; water / methanol / 2 h / 20 °C 2: potassium hydroxide / ethanol; water / 12 h / Reflux 3: pyridine / 20 °C 4: sodium hydride / tetrahydrofuran; mineral oil / 2 h / 20 °C 5: lithium aluminium tetrahydride / tetrahydrofuran / 2 h / Inert atmosphere; Reflux 6: boron trichloride / dichloromethane / -78 - 20 °C / Inert atmosphere View Scheme