1: 78 percent / pyridine / 1.87 h / 101 °C 2: H2, 0.1N aq.HCl / 10percent Pd-C / methanol / 2.33 h View Scheme

1: 91 percent / pyridine / 12 h 2: H2, HCl / 10percent Pd/C / methanol View Scheme

1: 78 percent / pyridine / 1.87 h / 101 °C 2: 21 percent / H2, NH3, conc.NH4OH / Raney nickel W-2 / methanol / 3 h / 0 °C / 2947.7 - 3102.9 Torr 3: 54 percent / diphenylphosphoryl azide / dimethylformamide / 96 h / -1 - 8 °C 4: 100 percent / H2 / 10percent Pd-C / methanol / 7 h View Scheme