[CH:1]([N:3]1[CH2:9][C:8]2[CH:10]=[CH:11][CH:12]=[CH:13][C:7]=2[O:6][CH2:5][CH2:4]1)=[O:2].[Cl:14][CH2:15][CH2:16][C:17](Cl)=[O:18].[Cl-].[Al+3].[Cl-].[Cl-]>ClCCCl>[Cl:14][CH2:15][CH2:16][C:17]([C:11]1[CH:12]=[CH:13][C:7]2[O:6][CH2:5][CH2:4][N:3]([CH:1]=[O:2])[CH2:9][C:8]=2[CH:10]=1)=[O:18]To a solution of 1.7 g of 4-formyl-2,3,4,5-tetrahydro-1,4-benzoxazepine and 1.28 g of 3-chloropropionyl chloride in 20 ml of 1,2-dichloroethane was added 3.0 g of aluminum chloride by portions. The mixture was stirred for 6 hours under reflux. The reaction mixture was poured into ice-water, and the resultant was subjected to extraction with dichloromethane. The extract was washed with water, dried over anhydrous sodium sulfate, and the solvent was distilled off under reduced pressure. The residue was purified by means of silica gel column chromatography (developing solvent: ethyl acetate) to give 1.95 g of the title compound as a colorless oily substance.
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