Pyridine derivatives belong to the most versatile heterocycles found in natural products and pharmaceuticals.[1] Substituted pyridine derivatives have also been used as reagents in organic synthesis and for new materials.[2] For example, functionalized 2, 2'-bipyridines and 2, 2': 6', 2''-terpyridines have received considerable attention as ligands in transitionmetal catalysis and as building blocks in supramolecular chemistry.[3] Although there are many ...