C1COCC1.[BH4-].[Na+].[C:8]([NH:11][C@H:12]([C@H:18]([OH:34])[CH2:19][CH2:20][CH2:21][CH2:22][CH2:23][CH2:24][CH2:25][CH2:26][CH2:27][CH2:28][CH2:29][CH2:30][CH2:31][CH2:32][CH3:33])[C:13](OCC)=[O:14])(=[O:10])[CH3:9].C(OCC)(=O)C>O>[C:8]([NH:11][C@H:12]([C@H:18]([OH:34])[CH2:19][CH2:20][CH2:21][CH2:22][CH2:23][CH2:24][CH2:25][CH2:26][CH2:27][CH2:28][CH2:29][CH2:30][CH2:31][CH2:32][CH3:33])[CH2:13][OH:14])(=[O:10])[CH3:9]A THF suspension (0.3 mL) containing sodium borohydride (38.2 mg, 0.93 mmol) was heated to 60° C., and a THF solution (2.5 mL) of ethyl (2R,3R)-2-acetylamino-3-hydroxyoctadecanoate (250.1 mg. 0.62 mmol) synthesized in the same manner as Example 14 was added thereto dropwise for 5.5 hours. After completion of the dropwise addition, the mixture was further stirred at 60° C. for 17 hours. After ethyl acetate and water were added thereto, the reaction mixture was stirred at 60° C. for 1 hour. After the organic layer was separated, the organic layer was washed with saturated brine and dried with magnesium sulfate. The solvent was removed in reduced pressure. It was confirmed that 178.7 mg of the title compound was contained (yield: 84%). HPLC analysis was carried out to find that the optical purity of the anti-form was 99% ee.
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