[C:1]1([CH2:7][CH2:8][NH:9][C:10](=[O:12])[CH3:11])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[C:13](Cl)(=[O:20])[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1.[Cl-].[Cl-].[Cl-].[Al+3].Cl>[N+](C1C=CC=CC=1)([O-])=O>[C:13]([C:4]1[CH:5]=[CH:6][C:1]([CH2:7][CH2:8][NH:9][C:10](=[O:12])[CH3:11])=[CH:2][CH:3]=1)(=[O:20])[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1N-(2-Phenylethyl)acetamide (49.01 mmol, 8.00 g) was introduced into nitrobenzene (40 ml). Benzoyl chloride (54.07 mmol, 7.60 g) was added thereto and then, at room temperature, aluminum tri-chloride (73.52 mmol, 9.80 g) was introduced in portions. The mixture was then heated at 50° C. for 8 h. The reaction mixture was poured into a mixture of ice and concentrated hydrochloric acid, and nitrobenzene was removed by steam distillation. The aqueous residue was extracted with ethyl acetate. The residue after concentration of the organic phase was chromatographed on silica gel (mobile phase dichloromethane/methanol (3% by volume)), resulting in 4.5 g of the title compound as orange oil.
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