[Cl:1][C:2]1[CH:3]=[C:4]([CH:20]=[CH:21][CH:22]=1)[C:5]([C@@H:7]1[O:12][CH2:11][CH2:10][N:9]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:8]1)=[O:6].[BH4-].[Na+].O>CO>[Cl:1][C:2]1[CH:3]=[C:4]([C@H:5]([OH:6])[C@@H:7]2[O:12][CH2:11][CH2:10][N:9]([C:13]([O:15][C:16]([CH3:18])([CH3:17])[CH3:19])=[O:14])[CH2:8]2)[CH:20]=[CH:21][CH:22]=1To a solution of (R)-tert-butyl 2-(3-chlorobenzoyl)morpholine-4-carboxylate (5.5 g, 16.9 mmol) in MeOH (50 mL), NaBH4 (5.14 g, 135 mmol) was added in portions. The mixture was stirred overnight and water (50 mL) was added, The mixture was concentrated in vacuo until MeOH was removed. The aqueous residue was extracted with EtOAc. The organic extracts were washed with brine and dried over Na2SO4. The crude product was purified by chromatography to afford (R)-tert-butyl 2-((S)-(3-chlorophenyl)(hydroxy)methyl)morpholine-4-carboxylate (4.3 g, 78%)
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