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]11.00 g of 3-(2-(3-chloropropoxy)ethyl)-1-benzothiophene was dissolved in 5 ml of dimethyl sulfoxide. Thereafter, 1.10 g of 3-azetidinol trifluoroacetate and 1.63 g of potassium carbonate were added to the obtained solution, and the mixture was then stirred at 70° C. for 2 hours. After cooling, water and ethyl acetate were added to the reaction mixture. The pH of the mixture was adjusted to pH 1 by addition of 6 mol/l hydrochloric acid, and a water layer was then separated. Ethyl acetate was added to the water layer, and the pH of the obtained mixture was adjusted to pH 10 by addition of a 2 mol/l aqueous sodium hydroxide solution, followed by separation of an organic layer. The organic layer was successively washed with water and a saturated saline solution, and then dried over anhydrous magnesium sulfate. Thereafter, the solvent was distilled away under a reduced pressure. The residue was purified by column chromatography (eluent; chloroform:methanol=30:1 to 10:1), so as to obtain 0.55 g of an achromatic oil product, 1-(3-(2-(1-benzothiophene-3-yl)ethoxy)propyl)-3-azetidinol.
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