[C:1]1([O:7][CH3:8])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[Cl:9][C:10]1[CH:11]=[C:12]([CH:16]=[CH:17][C:18]=1[Cl:19])[C:13](Cl)=[O:14].FC(F)(F)S([O-])(=O)=O.[Yb+3].FC(F)(F)S([O-])(=O)=O.FC(F)(F)S([O-])(=O)=O>[N+](C)([O-])=O>[CH3:8][O:7][C:1]1[CH:6]=[CH:5][C:4]([C:13]([C:12]2[CH:16]=[CH:17][C:18]([Cl:19])=[C:10]([Cl:9])[CH:11]=2)=[O:14])=[CH:3][CH:2]=1To commercially available nitromethane (10 ml) were added commercially available anisole (1.081 g), commercially available 3,4-dichlorobenzoyl chloride (2.095 g) and commercially available ytterbium(III) trifluoromethanesulfonate (620 mg), and the admixture was stirred at 60° C. for 8 hours. The reaction mixture was partitioned between water and chloroform, and the chloroform layer was then dried with anhydrous magnesium sulfate. After removing the solvent by reduced-pressure distillation, the resulting residue was purified by column chromatography on silica gel eluting with hexane/ethyl acetate to obtain 270 mg of the title compound (yield: 10%).
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