1: dichloromethane / 4 h 2: lithium aluminium tetrahydride / diethyl ether / 4 h / 0 °C 3: potassium carbonate / 1,4-dioxane / 7 h / 100 °C 4: hydrogenchloride / 1,4-dioxane; water / 24 h / 20 °C 5: sodium hydroxide / dichloromethane / 12 h / 25 °C / pH 7 - 8 View Scheme

1: lithium aluminium tetrahydride / diethyl ether / 4 h / 0 °C 2: potassium carbonate / 1,4-dioxane / 7 h / 100 °C 3: hydrogenchloride / 1,4-dioxane; water / 24 h / 20 °C 4: sodium hydroxide / dichloromethane / 12 h / 25 °C / pH 7 - 8 View Scheme

1: hydrogenchloride / 1,4-dioxane; water / 24 h / 20 °C 2: sodium hydroxide / dichloromethane / 12 h / 25 °C / pH 7 - 8 View Scheme