1: 36 percent / tetrabutylammonium fluoride / tetrahydrofuran / Ambient temperature 2: 59 percent / Amberlyst A15 resin (H(1+) form) / CH2Cl2 / 10 h / Ambient temperature View Scheme

With  2,3-dicyano-5,6-dichloro-p-benzoquinone in  benzene 1 h;  Heating;   

Multi-step reaction with 2 steps 1: 67 percent / lithium dicyclohexylamide / tetrahydrofuran; hexamethylphosphoric acid triamide / Ambient temperature2: 78 percent / 2,3-dichloro-5,6-dicyanobenzoquinone / benzene / 1 h / Heating  

With  tetrabutyl ammonium fluoride in  tetrahydrofuran  Ambient temperature;