[CH2:1]([O:3][C:4]([C:6]1[C:7](=[O:23])[C:8]2[C:13]([C:14]=1[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)=[CH:12][CH:11]=[C:10]([O:21][CH3:22])[CH:9]=2)=[O:5])[CH3:2].[CH:24]1([Mg]Cl)[CH2:29][CH2:28][CH2:27][CH2:26][CH2:25]1>C1COCC1>[CH2:1]([O:3][C:4]([C:6]1[C:7]([CH:24]2[CH2:29][CH2:28][CH2:27][CH2:26][CH2:25]2)([OH:23])[C:8]2[C:13]([C:14]=1[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)=[CH:12][CH:11]=[C:10]([O:21][CH3:22])[CH:9]=2)=[O:5])[CH3:2]6-Methoxy-1-oxo-3-phenyl-1H-indene-2-carboxylic acid ethyl ester (78 mg, 0.253 mmol) obtained in Example 1 was dissolved in THF, and 18%-cyclohexylmagnesium chloride (0.7 mL, 0.506 mmol) was added thereto, followed by stirring for 5 hrs at 0° C. The resulting mixture washed with saturated saline and extracted with ethyl acetate. The organic layer was separated, dried over anhydrous MgSO4, and concentrated under a reduced pressure. The resulting residue was purified by flash chromatography to obtain 30 mg of the titled compound (yield: 30%).
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