potassium carbonate; copper(l) iodide; 4,7-Dimethoxy-1,10-phenanthroline in dimethyl sulfoxide T=110°C; 24 h;

trans-N,N'-bis-[pyridin-2-ylmethylene]-cyclohexane-1,2-diamine; 3 A molecular sieve; caesium carbonate; copper(I) oxide in acetonitrile T=82°C; 48 h;