1: 62 percent / ammonia, ammonium hydroxide / dimethylformamide / 4 h / Ambient temperature 2: 64 percent / Lawesson's reagent / hexamethylphosphoric acid triamide / 2.45 h / 100 °C 3: 64 percent / ammonia / methanol / 18 h / 60 °C 4: 62 percent / boron trichloride / CH2Cl2 / 2.5 h / -78 °C View Scheme

Multi-step reaction with 3 steps 1: 62 percent / ammonia, ammonium hydroxide / dimethylformamide / 4 h / Ambient temperature2: 64 percent / Lawesson's reagent / hexamethylphosphoric acid triamide / 2.45 h / 100 °C3: 64 percent / ammonia / methanol / 18 h / 60 °C  

Multi-step reaction with 2 steps 1: benzene / 0.5 h / 10 °C2: 85 percent / benzene / 0.5 h / 10 °C