1: 91 percent / POCl3, Hexamethyl phosphoric acid triamide / 3 h / 150 - 160 °C 2: 94 percent / Hydrogen / Raney Nickel / dioxane 3: 70 percent / Potassium carbonate / 2.5 h / Heating View Scheme

Multi-step reaction with 2 steps 1: 91 percent / POCl3, Hexamethyl phosphoric acid triamide / 3 h / 150 - 160 °C2: 94 percent / Hydrogen / Raney Nickel / dioxane  

With  sulfuric acid in  acetic acid  Heating;