1: 1,8-diazabicyclo[5.4.0]undec-7-ene / methanol; tetrahydrofuran / 12 h / |Reflux 2: trifluoroacetic acid; methoxybenzene; sulfuric acid / 0.5 h / 90 °C 3: hydrogenchloride; water / acetonitrile / 10 h / |Reflux View Scheme