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

1: 1.) POCl3 / 1.) CH2Cl2, 30 min, 2.) CH2Cl2, reflux, 2.5 h 2: NaBH4 / tetrahydrofuran 3: pyridine, SOCl2 / CH2Cl2 / Ambient temperature 4: 1.) NaH / 1.) DMF, 30 min, 2.) DMF, 15 min 5: 78 percent / hydrolysis View Scheme

Multi-step reaction with 4 steps 1: 1.) POCl3 / 1.) CH2Cl2, 30 min, 2.) CH2Cl2, reflux, 2.5 h2: NaBH4 / tetrahydrofuran3: pyridine, SOCl2 / CH2Cl2 / Ambient temperature4: 1.) NaH / 1.) DMF, 30 min, 2.) DMF, 15 min  

With  toluene-4-sulfonic acid in  toluene 0.5 h;  Heating;  Yield given;