[Cl:1][C:2]1[C:7]([Cl:8])=[CH:6][CH:5]=[CH:4][C:3]=1[CH:9]1[CH2:14][C:13](=[O:15])[CH2:12][C:11](=[O:16])[CH2:10]1.[O-]CC.[Na+].Cl[CH2:22][C:23](=O)[CH3:24]>C(O)C.CN(C=O)C>[Cl:1][C:2]1[C:7]([Cl:8])=[CH:6][CH:5]=[CH:4][C:3]=1[CH:9]1[CH2:14][C:13](=[O:15])[C:12]2[C:23]([CH3:24])=[CH:22][O:16][C:11]=2[CH2:10]1To a solution of 5-(2,3-dichlorophenyl)cyclohexane-1,3-dione(mp205-206° C.; 1.29 g) in ethanol (10 ml) was added sodium ethoxide (0.37 g), and the mixture was stirred, under argon atmosphere, at room temperature for 15 minutes. To the mixture was added a solution of chloroacetone (0.45 ml) in DMF (10 ml), and the mixture was stirred at 100° C. overnight (13 hours). The reaction solution was cooled and concentrated under reduced pressure. To the residue was added ice-water, and the mixture was extracted with ethyl acetate. The upper layer was washed with saturated brine, dried (anhydrous magnesium sulfate), and concentrated under reduced pressure, and the residue was subjected to silica gel chromatography and eluted with ethyl acetate/hexane to give 6-(2,3-dichlorophenyl)-3-methyl-4,5,6,7-tetrahydrobenzofuran-4-one (0.18 g).
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