palladium diacetate; sodium hydroxide; ethylene dibromide in dichloromethane 72 h; Heating;

1: With trifluoromethylsulfonic anhydride in dichloromethane T=0°C; 0.5 h; Inert atmosphere; 2: With n-pentylmercaptane; N-ethyl-N,N-diisopropylamine in dichloromethane T=20°C; 16 h; Inert atmosphere;