hydrogen; palladium on activated charcoal in methanol 7 h;

1: 44 percent / DCC, DMAP / CH2Cl2 / 96 h / 0 deg C to r.t. 2: 2.46 g / TFA / CH2Cl2 / 1) 3 min, 0 deg C, 2) 17 min, without cooling 3: 78 percent / pyridine / 1.87 h / 101 °C 4: 21 percent / H2, NH3, conc.NH4OH / Raney nickel W-2 / methanol / 3 h / 0 °C / 2947.7 - 3102.9 Torr 5: 54 percent / diphenylphosphoryl azide / dimethylformamide / 96 h / -1 - 8 °C 6: 100 percent / H2 / 10percent Pd-C / methanol / 7 h View Scheme

1: 44 percent / DCC, DMAP / CH2Cl2 / 96 h / 0 deg C to r.t. 2: 2.46 g / TFA / CH2Cl2 / 1) 3 min, 0 deg C, 2) 17 min, without cooling 3: 78 percent / pyridine / 1.87 h / 101 °C 4: 21 percent / H2, NH3, conc.NH4OH / Raney nickel W-2 / methanol / 3 h / 0 °C / 2947.7 - 3102.9 Torr 5: 54 percent / diphenylphosphoryl azide / dimethylformamide / 96 h / -1 - 8 °C 6: 100 percent / H2 / 10percent Pd-C / methanol / 7 h 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

1: 54 percent / diphenylphosphoryl azide / dimethylformamide / 96 h / -1 - 8 °C 2: 100 percent / H2 / 10percent Pd-C / methanol / 7 h View Scheme

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

1: 2.46 g / TFA / CH2Cl2 / 1) 3 min, 0 deg C, 2) 17 min, without cooling 2: 78 percent / pyridine / 1.87 h / 101 °C 3: 21 percent / H2, NH3, conc.NH4OH / Raney nickel W-2 / methanol / 3 h / 0 °C / 2947.7 - 3102.9 Torr 4: 54 percent / diphenylphosphoryl azide / dimethylformamide / 96 h / -1 - 8 °C 5: 100 percent / H2 / 10percent Pd-C / methanol / 7 h View Scheme