1: hydrogenchloride / 1,4-dioxane / 2.5 h / 20 °C 2: triethylamine / N,N-dimethyl-formamide / 72 h 3: triethylamine / 1,4-dioxane 4: sodium hydroxide / ethanol; water / 1 h 5: sodium hydride / tetrahydrofuran / 4 h View Scheme

1: hydrogenchloride / 1,4-dioxane / 2.5 h / 20 °C 2: triethylamine / N,N-dimethyl-formamide / 72 h 3: triethylamine / 1,4-dioxane 4: sodium hydroxide / ethanol; water / 1 h View Scheme

1: hydrogenchloride / 1,4-dioxane / 2.5 h / 20 °C 2: triethylamine / N,N-dimethyl-formamide / 72 h 3: triethylamine / 1,4-dioxane View Scheme