4-Quinolone derivatives were conveniently reduced to the corresponding 1,2,3,4-tetrahydroquinoline-4-ols with excellent enantioselectivities through asymmetric transfer hydrogenation using a tethered rhodium complex and formic acid/triethylamine as the hydride source.
B. He, P. Phansavath and V. Ratovelomanana-Vidal, Org. Chem. Front., 2020, 7, 975 DOI: 10.1039/C9QO01514K
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