[Br:1][C:2]1[CH:9]=[C:8]([Br:10])[C:7]([OH:11])=[CH:6][C:3]=1[CH:4]=[O:5].F[C:13]1[CH:18]=[CH:17][C:16]([N+:19]([O-:21])=[O:20])=[CH:15][C:14]=1[F:22].C(=O)([O-])[O-].[K+].[K+]>CN(C=O)C>[Br:1][C:2]1[CH:9]=[C:8]([Br:10])[C:7]([O:11][C:13]2[CH:18]=[CH:17][C:16]([N+:19]([O-:21])=[O:20])=[CH:15][C:14]=2[F:22])=[CH:6][C:3]=1[CH:4]=[O:5]2,4-Dibromo-5-hydroxy-benzaldehyde (50 g, 178.6 mmol), 1,2-difluoro-4-nitrobenzene (28.4 g, 178.6 mmol) and potassium carbonate (49.0 g, 357.2 mmol) are stirred in DMF (500 mL) at 60° C. for 2 hours. The reaction is quenched with water (1000 mL) and extracted with methyl tert-butylether (MTBE) (2×500 mL). The organic layer is washed with saturated sodium chloride aqueous solution (2×500 mL), dried with anhydrous sodium sulfate, and concentrated to obtain a yellow solid. The crude solid is recrystallized in EtOAc/PE (1:5) to give 2,4-dibromo-5-(2-fluoro-4-nitrophenoxy)benzaldehyde as a yellow solid (52.8 g, 70.6% yield).
Wird geladen…
