[NH2:1][C:2]1[CH2:7][CH:6]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][C:9]=2[Cl:14])[CH2:5][C:4](=[O:15])[CH:3]=1.CO[CH:18](OC)[CH2:19][C:20](=O)[CH3:21].[OH-].[K+]>C(O)C.C1(C)C=CC=CC=1>[Cl:14][C:9]1[CH:10]=[CH:11][CH:12]=[CH:13][C:8]=1[CH:6]1[CH2:7][C:2]2[N:1]=[CH:18][CH:19]=[C:20]([CH3:21])[C:3]=2[C:4](=[O:15])[CH2:5]1A solution of 1-amino-5-(2-chlorophenyl)cyclohexen-3-one (2.7 g) in ethanol (50 ml) and toluene (150 m) was combined with acetyl acetoaldehyde dimethyl acetal (4.0 g) and 85% potassium hydroxide (0.67 g), and the mixture was heated under reflux. 85% Potassium hydroxide (0.14 g) was added three times at an interval of 30 minutes, and then heated under reflux further for 1 hour. The solvent was distilled off under reduced pressure, and the residue was combined with ethyl acetate, washed successively with water and saturated brine, and dried over magnesium sulfate. After concentrating under reduced pressure, the residue was subjected to a column chromatography on a silica gel (EtOAc-hexane) to obtain 7-(2-chlorophenyl)-4-methyl-5,6,7,8-tetrahydroquinolin-5-one (2.5 g) as a crystal. Melting point and NMR data were in agreement with those of the compound obtained in Reference Example 2.
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