tris-(o-tolyl)phosphine; palladium diacetate in triethylamine T=110°C; 72 h;

1: 70 percent / potassium carbonate / dimethylformamide / 20 h / 130 °C 2: 77 percent / tri-o-tolylphosphine / palladium diacetate / triethylamine / 72 h / 110 °C View Scheme

in dichloromethane T=20°C; 24 h;