Rhodium-catalyzed asymmetric transfer hydrogenation of 4-quinolone derivatives†
Abstract
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.