1: hydrogenchloride / methanol / 3.22 h / 3 - 9 °C 2: SnCl2·2H2O / methanol / 2 h / Reflux 3: acetic acid / 1 h / 90 °C 4: sodium hydroxide / methanol / 2 h / 90 °C 5: potassium carbonate / N,N-dimethyl-formamide / 4 h / 65 °C 6: ammonium formate / 5 palladium on charcoal / isopropyl alcohol; water / 17 h / 40 - 50 °C View Scheme