[Br:1][C:2]1[CH:7]=[C:6]([N+:8]([O-:10])=[O:9])[CH:5]=[CH:4][C:3]=1[CH:11](C(OCC)=O)[C:12]([O:14]CC)=[O:13].[OH-].[K+]>CO.O>[Br:1][C:2]1[CH:7]=[C:6]([N+:8]([O-:10])=[O:9])[CH:5]=[CH:4][C:3]=1[CH2:11][C:12]([OH:14])=[O:13]A solution of diethyl (2-bromo-4-nitrophenyl)propanedioate (5.6 g, 17 mmol) in 120 mL of methanol and 100 mL of water was added KOH (2.8 g, 50 mmol), and the mixture was heated to 70° C. for 3.5 hours. The reaction was cooled to ambient temperature, distilled off methanol under reduce pressure and adjusted pH to 2 with conc. HCl. Extracted with EtOAc and the organic layers were washed with water, brine and dried over anhydrous sodium sulfate, concentrated to get (2-bromo-4-nitrophenyl)acetic acid. 1H-NMR (300 MHz, CDCl3) δ ppm 8.39 (s, 1H), 8.07˜8.11 (m, 1H), 7.43 (d, J=8.3 Hz, 1H), 3.88 (s, 2H).
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