1: 47 percent / NaNH2 / toluene / 1 h / 80 °C 2: 89 percent / Triton B / dioxane; methanol / 48 h / Heating 3: 75 percent / H2SO4, acetic acid / 6 h / 120 °C 4: 71 percent / H2SO4, HNO3 / 2 h / -10 °C 5: 99 percent / H2 / Pd/C / ethanol View Scheme

1: 89 percent / Triton B / dioxane; methanol / 48 h / Heating 2: 75 percent / H2SO4, acetic acid / 6 h / 120 °C 3: 71 percent / H2SO4, HNO3 / 2 h / -10 °C 4: 99 percent / H2 / Pd/C / ethanol View Scheme

1: 75 percent / H2SO4, acetic acid / 6 h / 120 °C 2: 71 percent / H2SO4, HNO3 / 2 h / -10 °C 3: 99 percent / H2 / Pd/C / ethanol View Scheme

1: 71 percent / H2SO4, HNO3 / 2 h / -10 °C 2: 99 percent / H2 / Pd/C / ethanol View Scheme

1: 47 percent / NaNH2 / toluene / 1 h / 80 °C 2: 89 percent / Triton B / dioxane; methanol / 48 h / Heating 3: 75 percent / H2SO4, acetic acid / 6 h / 120 °C 4: 71 percent / H2SO4, HNO3 / 2 h / -10 °C 5: 99 percent / H2 / Pd/C / ethanol View Scheme

1: 99 percent / H2 / Pd/C / ethanol View Scheme