1: pyridine / dichloromethane / 0.5 h / 0 °C / Inert atmosphere 2: potassium carbonate / N,N-dimethyl-formamide / 48 h / 2 °C / Inert atmosphere 3: piperidine / ethanol / 12 h / Inert atmosphere; Reflux 4: palladium 10 on activated carbon; hydrogen / 1,4-dioxane / 20 h / 20 °C / 3620.13 Torr 5: hydrogenchloride; water / acetonitrile / 0.75 h / Reflux View Scheme