1: 72 percent / HNO3, H2SO4, SO3 / 1 h / Heating 2: 87 percent / PCl5, POCl3 / 6 h / 130 - 140 °C 3: 77 percent / N2H4*H2O / ethanol / 1.) 0 deg C, 0.75 h, 2.) 25 deg C, 3.5 h 4: tetrahydrofuran / 1.) 0 deg C, 1.5 h, 2.) 25 deg C, overnight 5: H2 / 5percent Pd/C / aq. ethanol / 2327.2 Torr 6: HCl / ethanol / 1.) 25 deg C, 5 h, 2.) reflux, 1.5 h 7: MnO2, 5 M NaOH / H2O / 0.83 h / pH 6 View Scheme

1: tetrahydrofuran / 1.) 0 deg C, 1.5 h, 2.) 25 deg C, overnight 2: H2 / 5percent Pd/C / aq. ethanol / 2327.2 Torr 3: HCl / ethanol / 1.) 25 deg C, 5 h, 2.) reflux, 1.5 h 4: MnO2, 5 M NaOH / H2O / 0.83 h / pH 6 View Scheme

1: 87 percent / PCl5, POCl3 / 6 h / 130 - 140 °C 2: 77 percent / N2H4*H2O / ethanol / 1.) 0 deg C, 0.75 h, 2.) 25 deg C, 3.5 h 3: tetrahydrofuran / 1.) 0 deg C, 1.5 h, 2.) 25 deg C, overnight 4: H2 / 5percent Pd/C / aq. ethanol / 2327.2 Torr 5: HCl / ethanol / 1.) 25 deg C, 5 h, 2.) reflux, 1.5 h 6: MnO2, 5 M NaOH / H2O / 0.83 h / pH 6 View Scheme

1: 77 percent / N2H4*H2O / ethanol / 1.) 0 deg C, 0.75 h, 2.) 25 deg C, 3.5 h 2: tetrahydrofuran / 1.) 0 deg C, 1.5 h, 2.) 25 deg C, overnight 3: H2 / 5percent Pd/C / aq. ethanol / 2327.2 Torr 4: HCl / ethanol / 1.) 25 deg C, 5 h, 2.) reflux, 1.5 h 5: MnO2, 5 M NaOH / H2O / 0.83 h / pH 6 View Scheme