[O-]CC.[Na+].C(O)C.[Cl:8][C:9]1[CH:14]=[C:13]([Cl:15])[CH:12]=[CH:11][C:10]=1[C:16](=[O:18])[CH3:17].[C:19](OCC)(=[O:25])[C:20]([O:22][CH2:23][CH3:24])=[O:21].Cl>O1CCCC1.C(Cl)(Cl)Cl>[Cl:8][C:9]1[CH:14]=[C:13]([Cl:15])[CH:12]=[CH:11][C:10]=1[C:16](=[O:18])[CH2:17][C:19](=[O:25])[C:20]([O:22][CH2:23][CH3:24])=[O:21]A 20% sodium ethoxide-ethanol solution (17 g) was added to tetrahydrofuran (100 ml), and the mixture was cooled to 0° C. It took 60 minutes to dropwise add a solution of 2′,4′-dichloroacetophenone (9.45 g) and diethyl oxalate (7.30 g) in tetrahydrofuran (100 ml) to the mixture. After the completion of the dropping, the mixture was allowed to warm to a room temperature and stirred for 2 hours. To the mixture, 2-N hydrochloric acid (200 ml) and chloroform (200 ml) were added. The organic layer was collected by separation and dried over anhydrous magnesium sulfate, and the solvent was distilled off. Thus, the title compound (11.3 g, 78%) as a light-brown oily substance was obtained.
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