pyridine; copper diacetate in dichloromethane T=40°C; 24 h; Inert atmosphere; regioselective reaction;

4,7-bis(2-hydroxyethylamino)-1,10-phenanthroline; sodium L-ascorbate; potassium hydroxide; copper(I) bromide in water; N,N-dimethyl-formamide T=120°C; 48 h; Inert atmosphereSealed tube; regioselective reaction;

4,7-bis(2-hydroxyethylamino)-1,10-phenanthroline; sodium L-ascorbate; potassium hydroxide; copper(I) bromide in water; N,N-dimethyl-formamide T=120°C; 48 h; Inert atmosphereSealed tube; regioselective reaction;

4,7-(dipyrrolidin-1-yl)-1,10-phenanthroline; potassium hydroxide; copper(I) bromide in water T=100°C; 48 h; Sealed tubeInert atmosphereGreen chemistry;