[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[CH2:8][C:9](=[O:17])[CH:10]([CH3:16])[C:11]([O:13][CH2:14][CH3:15])=[O:12].C1OC2C(C3C4OCOC=4C=CC=3P(C3C=CC=CC=3)C3C=CC=CC=3)=C(P(C3C=CC=CC=3)C3C=CC=CC=3)C=CC=2O1>>[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[CH2:8][CH:9]([OH:17])[CH:10]([CH3:16])[C:11]([O:13][CH2:14][CH3:15])=[O:12]The thus obtained compound (5) is asymmetrically hydrogenated using ((R)—SEGPHOS™)-Ru complex to obtain optically active ethyl 4-(2-fluorophenyl)-3-hydroxy-2-methylbutyrate (6) as a mixture of diastereomers.
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