Heterogeneous catalyzed aryl-nitrogen bond formations using a valine derivative bridged metal-organic coordination...

A new 1D macrocyclic copper(ii) coordination polymer, [Cu(2)] (, = N-(4-pyridyl)-d,l-valine), based on a valine derived ligand was synthesized and characterized by single-crystal X-ray diffraction studies. The catalytic experiments showed that compound was an efficient catalyst for the cross-coupling reaction of arylboronic acids with imidazole in the absence of additional additives. The crystal structure analysis of suggested that the vacant axial coordination position of the copper(ii) atoms played a very important role in the efficient catalytic transformation process.