[Br:1]N1C(=O)NC(=O)N(Br)C1=O.[CH2:12]([O:14][C:15]1[CH:16]=[C:17]([C:25]2[CH:30]=[CH:29][C:28]([F:31])=[CH:27][CH:26]=2)[CH:18]=[CH:19][C:20]=1[C:21]([O:23][CH3:24])=[O:22])[CH3:13].CN(C=O)C>O>[Br:1][C:18]1[CH:19]=[C:20]([C:21]([O:23][CH3:24])=[O:22])[C:15]([O:14][CH2:12][CH3:13])=[CH:16][C:17]=1[C:25]1[CH:26]=[CH:27][C:28]([F:31])=[CH:29][CH:30]=1Dibromoisocyanuric acid (3.28 g) was added to a mixture of methyl 3-ethoxy-4′-fluorobiphenyl-4-carboxylate (5.92 g) and DMF (40 mL), and the resultant mixture was stirred overnight at room temperature. Water was added to the reaction mixture at room temperature, followed by extraction with ethyl acetate. The obtained organic layer was washed with saturated saline and dried over anhydrous magnesium sulfate, and then, the solvent was distilled off under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate) to obtain the title compound (7.62 g).
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