CoBr2(1,2-bis(diphenylphosphino)ethane); zinc(II) iodide; zinc in dichloromethane T=20°C; Diels-Alder reaction; 16 h;

1: With (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; sodium hydroxide in tetrahydrofuran Suzuki cross-coupling reaction; 12 h; 2: With 2,3-dicyano-5,6-dichloro-p-benzoquinone in toluene T=20°C; 0.5 h;