[OH-].[Na+].[F:3][CH2:4][CH2:5][N:6]1[CH2:10][CH2:9][C@H:8]([O:11]C(=O)C)[CH2:7]1>CO>[F:3][CH2:4][CH2:5][N:6]1[CH2:10][CH2:9][C@H:8]([OH:11])[CH2:7]14N aqueous sodium hydroxide solution (2 mL) was added to methanol (10 mL) solution of (3S)-1-(2-fluoroethyl)-3-acetoxypyrrolidine (507 mg, 2.89 mmols), and stirred at room temperature for an hour. The reaction liquid was concentrated under reduced pressure, extracted with chloroform and dried over anhydrous sodium sulfate. Concentrating the reaction liquid under reduced pressure, the title compound (135 mg, 35%) was obtained.
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