1: triethylamine / dichloromethane / 1 h / 0 °C / Inert atmosphere 2: tris-(dibenzylideneacetone)dipalladium(0); potassium carbonate; bis[2-(diphenylphosphino)phenyl] ether / toluene / 15 h / 110 °C / Inert atmosphere 3: potassium tert-butylate / tetrahydrofuran / 8 h / 50 °C / Inert atmosphere View Scheme

With  triethylamine in  dichloromethane T=0°C; 1 h;  Inert atmosphere;