[NH2:1][C:2]1[CH2:7][CH:6]([C:8]2[CH:13]=[CH:12][CH:11]=[C:10]([Cl:14])[C:9]=2[Cl:15])[CH2:5][C:4](=[O:16])[CH:3]=1.[OH-].[K+]>C(O)C.C1(C)C=CC=CC=1>[Cl:15][C:9]1[C:10]([Cl:14])=[CH:11][CH:12]=[CH:13][C:8]=1[CH:6]1[CH2:7][C:2]2[N:1]=[CH:7][CH:2]=[C:3]([CH3:4])[C:3]=2[C:4](=[O:16])[CH2:5]1In a mixture of ethanol (30 ml) and toluene (90 ml) was dissolved 1-amino-5-(2, 3-dichlorophenyl)cyclohexen-3-one (1.5 g), and to the solution were added 3-oxobutylaldehydedimethylacetal (2 g) and granulated potassium hydroxide (330 mg). The mixture was stirred at 115° C. (bath temperature), and to the mixture was added granulated potassium hydroxide (70 mg), 30 minutes later; 1 hour later; and 1.5 hours, respectively. The reaction solution was stirred at the same temperature for 1 hour, cooled and concentrated under reduced pressure, and to the residue were added ethyl acetate (50 ml) and water (20 ml). The mixture was shaken and separated ethyl acetate layer was washed with brine. Under reduced pressure, ethyl acetate was evaporated, and the residue was purified with silica gel column chromatography (EtOAc/hexane) and eluted with ethyl acetate/hexane to give 7-(2,3-dichlorophenyl)-4-methyl-5,6,7,8-tetrahydroquinolin-5-one (1.05 g) as colorless crystals.
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