Cl[CH2:2][CH2:3][CH2:4][O:5][CH2:6][CH2:7][C:8]1[CH:16]=[CH:15][C:11]2[CH:12]=[CH:13][S:14][C:10]=2[CH:9]=1.Cl.[NH:18]1[CH2:21][CH:20]([OH:22])[CH2:19]1.C(=O)([O-])[O-].[K+].[K+].Cl>CS(C)=O.C(OCC)(=O)C.O>[S:14]1[C:10]2[CH:9]=[C:8]([CH2:7][CH2:6][O:5][CH2:4][CH2:3][CH2:2][N:18]3[CH2:21][CH:20]([OH:22])[CH2:19]3)[CH:16]=[CH:15][C:11]=2[CH:12]=[CH:13]1
In 5 mL of dimethyl sulfoxide was dissolved 1.00 g of 6-[2-(3-chloropropoxy)ethyl]-1-benzothiophene, and 0.86 g of 3-azetidinol hydrochloride and 1.63 g of potassium carbonate were added to the solution. The resulting mixture was stirred at 75° C. for 2.5 hours and then at 95° C. for 1.5 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 5:1) to obtain 0.28 g of 1-{3-[2-(1-benzothiophen-6-yl)ethoxy]propyl}-3-azetidinol as a colorless oil.
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