Amberlyst A15 resin (H(1+) form) in dichloromethane 10 h; Ambient temperature;

With  tetrabutyl ammonium fluoride in  tetrahydrofuran  Ambient temperature;   

Multi-step reaction with 3 steps 1: 67 percent / lithium dicyclohexylamide / tetrahydrofuran; hexamethylphosphoric acid triamide / Ambient temperature2: 78 percent / 2,3-dichloro-5,6-dicyanobenzoquinone / benzene / 1 h / Heating3: 36 percent / tetrabutylammonium fluoride / tetrahydrofuran / Ambient temperature  

Multi-step reaction with 2 steps 1: 78 percent / 2,3-dichloro-5,6-dicyanobenzoquinone / benzene / 1 h / Heating2: 36 percent / tetrabutylammonium fluoride / tetrahydrofuran / Ambient temperature