[Br:1][C:2]1[CH:3]=[C:4]([CH2:9][CH2:10][C:11]([O:13][CH3:14])=[O:12])[CH:5]=[CH:6][C:7]=1[OH:8].[H-].[Na+].Br[CH:18]1[CH2:22][CH2:21][CH2:20][CH2:19]1.C(OC(C)C)(C)C>CN(C=O)C.O>[Br:1][C:2]1[CH:3]=[C:4]([CH2:9][CH2:10][C:11]([O:13][CH3:14])=[O:12])[CH:5]=[CH:6][C:7]=1[O:8][CH:18]1[CH2:22][CH2:21][CH2:20][CH2:19]1A solution of Intermediate 5 (4.50 g) in DMF (20 ml) was added with 60% sodium hydride (440 mg, KANTO) under ice cooling. The reaction mixture was stirred for 10 minutes, then added with bromocyclopentane (1.61 ml, TCI), warmed to room temperature, stirred for 1.5 hours, then warmed to 60° C., and further stirred for 16 hours. The reaction mixture was added with water (50 ml) and isopropyl ether (300 ml)) for extraction. The organic layer was successively washed with saturated aqueous sodium hydrogencarbonate, saturated aqueous ammonium chloride, and saturated brine and dried, and then the solvent was evaporated under reduced pressure. The residue was purified by flash column chromatography (hexane:isopropyl ether=7:1) to obtain the title compound (Compound No. A-5, 2.50 g).
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