[H-].[Al+3].[Li+].[H-].[H-].[H-].[N:7]1([C:11](=O)[CH2:12][N:13]2[CH2:18][CH2:17][N:16]([C:19](=O)[C:20]3[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=3)[CH2:15][CH2:14]2)[CH2:10][CH2:9][CH2:8]1.O.[OH-].[Na+]>O1CCCC1>[N:7]1([CH2:11][CH2:12][N:13]2[CH2:14][CH2:15][N:16]([CH2:19][C:20]3[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=3)[CH2:17][CH2:18]2)[CH2:8][CH2:9][CH2:10]1Lithium aluminium hydride (405 mg) was suspended in tetrahydrofuran (10 ml) under a nitrogen atmosphere with stirring in an ice water bath, 1-(azetidin-1-yl)-2-(4-benzoylpiperazin-1-yl)ethanone (730 mg) and tetrahydrofuran (5 ml×3) was added thereto. The reaction mixture was stirred at 60° C. for 3 hours. The reaction mixture was allowed to cool down to room temperature, and water (0.4 ml), a 5N aqueous solution of sodium hydroxide (0.4 ml) and water (1.2 ml) were added thereto, followed by stirring for 13 hours. The insoluble matter in the reaction mixture was removed by filtration through celite, and washed with ethyl acetate (100 ml). The solvent was distilled off under reduced pressure to give a crude product of the title compound (687 mg) as a pale yellow oil.
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