in benzene 16 h; Heating; Title compound not separated from byproducts;

Multi-step reaction with 2 steps 1: palladium / Hydrogenation2: aqueous hydrochloric acid  

Multi-step reaction with 4 steps 1: 84 percent / Potasium hydrogen sulfate, hydroquinone / H2O / 150 - 185 °C2: 90 percent / Sulfuric acid / H2O / 6.5 h / 50 °C3: 75 percent / Anhydrous ammonia / methanol / 14 h / 150 °C / 45003.6 - 52504.2 Torr4: 91 percent / A cation-exchanging resin (Ostion KS) / H2O / 120 °C  

Multi-step reaction with 4 steps 2: pyridine3: amidosulfuric acid; nitric acid4: acetone; aqueous NaOH-solution  

Multi-step reaction with 2 steps 1: HCl; acetic acid2: pyridine