[BH4-].[Na+].[F:3][C:4]1[C:16]([F:17])=[C:15]([F:18])[CH:14]=[CH:13][C:5]=1[NH:6][C@@H:7]([CH3:12])[C:8](OC)=[O:9].Cl.C(=O)([O-])O.[Na+]>CC(O)C.CO>[F:3][C:4]1[C:16]([F:17])=[C:15]([F:18])[CH:14]=[CH:13][C:5]=1[NH:6][C@@H:7]([CH3:12])[CH2:8][OH:9]Under ice-cooling, sodium borohydride (1.2 g) was dissolved in IPA (50 ml). After adding methanol (5 ml), a solution of the compound (5.0 g) obtained in Example 1 in IPA was dropped therein to. Then the liquid reaction mixture was heated to 50° C. and stirred for 1 hour. Next, hydrochloric acid (1 mol/l) was added and the mixture was stirred for a while. Then a saturated aqueous solution of sodium hydrogencarbonate was added and the mixture was extracted with ethyl acetate. The extract was washed with water, dried over anhydrous magnesium sulfate and filtered. After evaporating the solvent, the obtained residue was subjected to silica gel column chromatography to give 3.7 g (84%) of the title compound as an oily substance.
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