[H-].[Na+].[Cl-].[Mg+2].[Cl-].[C:6]([O:9][C:10]([CH3:13])([CH3:12])[CH3:11])(=[O:8])[CH3:7].[Cl:14][CH2:15][C@@H:16]([OH:23])[CH2:17][C:18](OCC)=[O:19].C([N-]C(C)C)(C)C.[Li+]>CCCCCC.O1CCCC1>[Cl:14][CH2:15][C@@H:16]([OH:23])[CH2:17][C:18](=[O:19])[CH2:7][C:6]([O:9][C:10]([CH3:13])([CH3:12])[CH3:11])=[O:8]Separately, 240 mg (6 mmol equivalent) of sodium hydride (60% in mineral oil) was washed with hexane and, then, 6 ml of tetrahydrofuran was added. Then, at 5° C., 1.71 g (18.0 mmol) of magnesium chloride, 1.74 g (15.0 mmol) of tert-butyl acetate and 1.0 g (6 mmol) of ethyl (3S)-4-chloro-3-hydroxybutyrate were added and the mixture was stirred for 30 minutes. To this mixture, the lithium diisopropylamide solution prepared above was added dropwise over 10 minutes at the same temperature and the reaction mixture was further stirred at an elevated temperature of 25° C. for 3 hours.
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