1.1: pyridine / dichloromethane / 0.5 h 2.1: ammonium formate / palladium 10 on activated carbon / water; industrial methylated spirit / 1 h / Reflux 3.1: hydrogenchloride; sodium nitrite / water / 0 °C 3.2: 0 - 20 °C 4.1: sodium hydroxide; water / ethanol / 6 h / 50 °C View Scheme