1: tetrabutyl ammonium fluoride / tetrahydrofuran / 0.33 h / 0 - 20 °C 2: iodine cloride; N-butylamine / dichloromethane; N,N-dimethyl-formamide / 0.33 h / 0 °C 3: lithium hydroxide hydrate / water; methanol / 1.5 h / 4 °C 4: hydrogenchloride / 1,4-dioxane / 20 °C / |Inert atmosphere View Scheme

1: tetrabutyl ammonium fluoride / tetrahydrofuran / 0.33 h / 0 - 20 °C 2: lithium hydroxide hydrate / water; methanol / 1.5 h / 4 °C 3: hydrogenchloride / 1,4-dioxane / 20 °C / |Inert atmosphere View Scheme

1: tetrabutyl ammonium fluoride / tetrahydrofuran / 0.33 h / 0 - 20 °C 2: lithium hydroxide hydrate / water; methanol / 1.5 h / 4 °C View Scheme