Cl[CH2:2][CH2:3][CH2:4][O:5][CH2:6][CH2:7][C:8]1[C:12]2[CH:13]=[CH:14][CH:15]=[CH:16][C:11]=2[S:10][CH:9]=1.FC(F)(F)C(O)=O.[NH:24]1[CH2:27][CH:26]([OH:28])[CH2:25]1.C(=O)([O-])[O-].[K+].[K+].Cl>CS(C)=O.C(OCC)(=O)C.O>[S:10]1[C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][C:12]=2[C:8]([CH2:7][CH2:6][O:5][CH2:4][CH2:3][CH2:2][N:24]2[CH2:27][CH:26]([OH:28])[CH2:25]2)=[CH:9]1In 5 mL of dimethyl sulfoxide was dissolved 1.00 g of 3-[2-(3-chloropropoxy)ethyl]-1-benzothiophene, and 1.10 g of 3-azetidinol trifluoroacetate and 1.63 g of potassium carbonate were added to the solution, after which the resulting mixture was stirred at 70° C. for 2 hours. After the reaction mixture was cooled, water and ethyl acetate were added thereto and the pH was adjusted to 1 with 6 mol/L hydrochloric acid, and the aqueous layer was separated. Ethyl acetate was added to the aqueous layer and the pH was adjusted to 10 with a 2 mol/L aqueous sodium hydroxide solution, after which the organic layer was separated. The organic layer was washed with water and then a saturated aqueous sodium chloride solution, dried over anhydrous magnesium sulfate, and then distilled under reduced pressure to remove the solvent. The residue was purified by a column chromatography (eluent; chloroform:methanol=30:1 to 10:1) to obtain 0.55 g of 1-{3-[2-(1-benzothiophen-3-yl)ethoxy]propyl}-3-azetidinol as a colorless oil.
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