Rh/()-DTBM-SegPhos-catalyzed asymmetric hydrogenation of prochiral ()-2-(2-oxo-2-benzo[][1,4]oxazin-3(4)-ylidene)acetate esters was successfully developed. A series of chiral dihydrobenzoxazinones were prepared through this efficient methodology with good to excellent results (up to >99% conversion, 93% yield and >99% ee), which are important motifs in the biologically active molecules.
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