An Easy One-Pot Synthesis of Diverse 2,5-Di(2-pyridyl)pyrroles: A Versatile Entry Point to Metal Complexes of Functionalised, Meridial and Tridentate 2,5-Di(2-pyridyl)pyrrolato Ligands

作者：McSkimming Alex; Diachenko Vera; London Rachel; Olrich Kiara; Onie C Jessica; Bhadbhade Mohan M; Bucknall Martin P; Read Roger W; Colbran Stephen B^*

来源：Chemistry - A European Journal, 2014, 20(36): 11445-11456.

DOI：10.1002/chem.201402157

• N ligands
• reduction
• synthetic methods
• transition metals
• tridentate ligands

A wide variety of 2,5-di(2-pyridyl)pyrroles (dppHs) substituted at the C3 and C4 positions of the pyrrole core were obtained by direct condensation of a 2-pyridylcarboxaldehyde (2 equiv), an a-methylene ketone with at least one electron-withdrawing substituent and ammonium acetate. A novel 2,5-di(1,10-phenanthrolin-2-yl) pyrrole was also characterised. The dppHs provide a direct, quick entry to dipyridylpyrrolato (dpp(-))-metal complexes. The meridial tridentate dpp(-) ligand is a useful anionic analogue of the terpyridyl ligand. The first (dpp)Ru complexes are described; the 3,4-substitution of the central pyrrole significantly perturbs the potentials of the redox processes of these complexes. A [(dpp) Ru(bpy)(MeCN)](+) (bpy= 2,2'-bipyridine) complex is an electrocatalyst for the reductive disproportionation of carbon dioxide to carbon monoxide and the carbonate ion.

• 出版日期2014-9-1