B(Br)(Br)Br.[Cl:5][C:6]1[CH:7]=[C:8](/[C:15](/[C:23]2[NH:28][C:27](=[O:29])[C:26]([CH:30]3[CH2:32][CH2:31]3)=[CH:25][CH:24]=2)=[CH:16]\[C@H:17]2[CH2:21][CH2:20][C:19](=[O:22])[NH:18]2)[CH:9]=[CH:10][C:11]=1[O:12]CC.O>CCCCCC.C(Cl)(Cl)Cl>[Cl:5][C:6]1[CH:7]=[C:8](/[C:15](/[C:23]2[NH:28][C:27](=[O:29])[C:26]([CH:30]3[CH2:32][CH2:31]3)=[CH:25][CH:24]=2)=[CH:16]\[C@H:17]2[CH2:21][CH2:20][C:19](=[O:22])[NH:18]2)[CH:9]=[CH:10][C:11]=1[OH:12]A 1 M solution of boron tribromide in hexane (0.8 mL) was added to a solution of 6-{(E)-1-(3-chloro-4-ethoxyphenyl)-2-[(2R)-5-oxopyrrolidin-2-yl]ethenyl}-3-cyclopropylpyridin-2(1H)-one obtained in Example 4-10 (110 mg) in chloroform (2 mL), and the mixture was stirred at room temperature for two hours. The reaction solution was poured into water, followed by extraction with ethyl acetate. The organic layer was washed with brine, dried over anhydrous magnesium sulfate and filtered. The solvent was then evaporated under reduced pressure. The residue was purified by silica gel column chromatography (chloroform:methanol=100:0→90:10) to give the title compound as a colorless amorphous (17.5 mg).
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