So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Chan, Sau Hing; Lam, Kim Hung; Li, Yue-Ming; Xu, Lijin; Tang, Weijun; Lam, Fuk Loi; Lo, Wai Hung; Yu, Wing Yiu; Fan, Qinghua; Chan, Albert S. C. researched the compound: (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine( cas:221012-82-4 ).SDS of cas: 221012-82-4.They published the article 《Asymmetric hydrogenation of quinolines with recyclable and air-stable iridium catalyst systems》 about this compound( cas:221012-82-4 ) in Tetrahedron: Asymmetry. Keywords: quinoline asym hydrogenation recyclable iridium catalyst; tetrahydroquinoline alkyl asym synthesis. We’ll tell you more about this compound (cas:221012-82-4).
The iridium complex-catalyzed asym. hydrogenation of quinolines in a poly(ethylene glycol) di-Me ether (DMPEG)/hexane biphasic system was studied. Catalysts with C2-sym. ligands such as Xyl-P-Phos, Cl-MeO-BIPHEP, SYNPHOS, and DifluorPhos are highly effective for this type of reaction. Most of the catalysts tested can be retained in DMPEG (Mn = 500), and the asym. hydrogenation of various quinoline substrates can be carried out in DMPEG/hexane biphasic system with up to 92% ee. The catalysts and the products can be separated via simple phase separation, and the reactivity/stereoselectivity of the catalysts can be retained for at least three reaction cycles.
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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider