1: 90 percent / TFA, H2O / CH2Cl2 / 24 h / Ambient temperature 2: 93 percent / pyridine / CH2Cl2 / 1 h / 0 °C 3: 60 percent / NaN3, benzo-15-crown-5 / dimethylformamide / Ambient temperature 4: 90 percent / pyridine / CH2Cl2 / 0.17 h / 0 °C 5: 80 percent / tetrahydrofuran / 1 h / Ambient temperature 6: 91 percent / K2CO3 / methanol / 2 h / Ambient temperature 7: 80 percent / H2 / 20percent Pd(OH)2 on charcoal / ethanol View Scheme