(R)-(+)-1,1'-binaphthyl-2,2'-diamine; caesium carbonate; copper dichloride in acetonitrile T=82°C; 96 h; Inert atmosphere;

Multi-step reaction with 2 steps 1: pyridine / 2 h / |Reflux2: Lawesson's reagent / 1,2-dichloro-benzene / 6 h / 80 °C / |Reflux