1: 82 percent / diphenyl phosphoryl azide; DEAD; PPh3 / tetrahydrofuran / 12 h / 0 - 20 °C 2: 97 percent / H2 / Pd/C / methanol / 12 h / 20 °C / 760 Torr 3: 100 percent / DMAP; pyridine 4: HNO3; H2SO4 / 1.5 h / -20 - 20 °C 5: aq. HCl / 90 °C View Scheme

1: 82 percent / diphenyl phosphoryl azide; DEAD; PPh3 / tetrahydrofuran / 12 h / 0 - 20 °C 2: 97 percent / H2 / Pd/C / methanol / 12 h / 20 °C / 760 Torr 3: 100 percent / DMAP; pyridine 4: HNO3; H2SO4 / 1.5 h / -20 - 20 °C 5: aq. HCl / 90 °C View Scheme

1: 82 percent / diphenyl phosphoryl azide; DEAD; PPh3 / tetrahydrofuran / 12 h / 0 - 20 °C 2: 97 percent / H2 / Pd/C / methanol / 12 h / 20 °C / 760 Torr 3: 100 percent / DMAP; pyridine 4: HNO3; H2SO4 / 1.5 h / -20 - 20 °C 5: aq. HCl / 90 °C 6: 80 percent / 1 h / 90 °C View Scheme

1: 82 percent / diphenyl phosphoryl azide; DEAD; PPh3 / tetrahydrofuran / 12 h / 0 - 20 °C 2: 97 percent / H2 / Pd/C / methanol / 12 h / 20 °C / 760 Torr View Scheme

1: 82 percent / diphenyl phosphoryl azide; DEAD; PPh3 / tetrahydrofuran / 12 h / 0 - 20 °C 2: 97 percent / H2 / Pd/C / methanol / 12 h / 20 °C / 760 Torr 3: 100 percent / DMAP; pyridine 4: HNO3; H2SO4 / 1.5 h / -20 - 20 °C 5: aq. HCl / 90 °C View Scheme