1: 88 percent / KNO3, H2SO4 / 3 h / 3 - 5 °C 2: 87 percent / triethylamine / dimethylsulfoxide / 5 h / Ambient temperature 3: HCl (gas) / dioxane / 48 h / Ambient temperature 4: ethanol. NH3 / 18 h / 60 °C 5: H2 / 10percent Pd/C / ethanol; H2O / 6 h / 3102.9 Torr View Scheme

1: 87 percent / triethylamine / dimethylsulfoxide / 5 h / Ambient temperature 2: HCl (gas) / dioxane / 48 h / Ambient temperature 3: ethanol. NH3 / 18 h / 60 °C 4: H2 / 10percent Pd/C / ethanol; H2O / 6 h / 3102.9 Torr View Scheme