1: 55 percent / NaN3 / dimethylformamide / 20 h / 120 °C 2: 80 percent / Bu4NF / tetrahydrofuran / 24 h / 20 °C 3: 68 percent / aq. PPh3 / tetrahydrofuran / 24 h / 20 °C 4: 62 percent / NaHCO3 / methanol / 3 h / 20 °C 5: 89 percent / aq. TFA / 5 h / 20 °C 6: 45 percent / H2 / Pd/C / methanol / 24 h 7: H2 / Pd(OH)2/C / methanol / 24 h View Scheme