2,3-dicyano-5,6-dichloro-p-benzoquinone in 1,4-dioxane 72 h; Heating;

1: 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; 4-(N,N-dimethlyamino)pyridine / dichloromethane / 18 h / 20 °C / |Inert atmosphere 2: pyridine; potassium hydroxide / 2 h / 50 °C / |Inert atmosphere 3: sulfuric acid / acetic acid / 1 h / 110 °C / |Inert atmosphere View Scheme

1: 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; 4-(N,N-dimethlyamino)pyridine / dichloromethane / 18 h / 20 °C / |Inert atmosphere 2: pyridine; potassium hydroxide / 2 h / 50 °C / |Inert atmosphere 3: sulfuric acid / acetic acid / 1 h / 110 °C / |Inert atmosphere View Scheme