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