1: 1.) LiN3, 2.) 20percent H2SO4 / 1.) THF, room temperature, 6 h, 2.) THF, room temperature, 1 h 2: 90 percent / pyridine / CH2Cl2 / 0.17 h / 0 °C 3: 80 percent / tetrahydrofuran / 1 h / Ambient temperature 4: 91 percent / K2CO3 / methanol / 2 h / Ambient temperature 5: 80 percent / H2 / 20percent Pd(OH)2 on charcoal / ethanol View Scheme