[CH3:1][C:2](O)([CH3:14])[CH2:3][C:4]1[CH:13]=[CH:12][C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[CH:5]=1.[C:16](#[N:18])[CH3:17].S(=O)(=O)(O)[OH:20].[OH-].[Na+]>C(O)(=O)C>[CH3:1][C:2]([NH:18][C:16](=[O:20])[CH3:17])([CH3:14])[CH2:3][C:4]1[CH:13]=[CH:12][C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[CH:5]=1To 2-methyl-1-(naphthalen-2-yl)-2-propanol (500 mg) obtained in Step 7 were added acetonitrile (0.5 ml) and acetic acid (0.5 ml) in this order. After ice-cooling the mixture, sulfuric acid (0.5 ml) was added dropwise. The mixture was stirred under ice-cooling for 20 min and poured into a 1N aqueous sodium hydroxide solution, and the mixture was extracted with diethyl ether. The organic layer was washed with water, dried over sodium sulfate, and concentrated under reduced pressure. The obtained residue was subjected to recrystallization from ethyl acetate-n-hexane to give the title compound (303 mg).
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