In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Highly effective chiral dipyridylphosphine ligands: Synthesis, structural determination, and applications in the Ru-catalyzed asymmetric hydrogenation reactions, published in 2001-05-31, which mentions a compound: 221012-82-4, mainly applied to chiral dipyridylphosphine ligand ruthenium enantioselective hydrogenation olefin ketoester, Quality Control of (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine.
The synthesis of the new heteroaromatic chiral diphosphine ligands (R) and (S)-(P-phos) [P- phos = 2,2′,6,6′-tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine] was carried out by a standard synthetic protocol ending up with an Ullmann coupling, followed by resolution of the racemic product. The ligands display an axial chirality due to atropisomery-, analogous to that observed in the parent ligand MeO-BIPHEP. Well-defined ruthenium(II) catalysts were prepared and employed to catalyze the hydrogenation of a prochiral olefins of pharmaceutical relevance and various β-ketoesters.
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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider