1: polyphosphoric acid / 180 °C 2: H2 / Pd-C / ethanol / 45 °C / 760 Torr View Scheme

1: 44 percent / 37percent aq. HCl / 5 h / 60 °C 2: 94 percent / 2N aq. HCl, H2 / 5percent Pd/C / methanol / 4 h / 60 °C / 3420 Torr 3: 70 percent / triethylamine / 1,2-dimethoxy-ethane / 20 h / Ambient temperature View Scheme