Cl[C:2]1[CH:18]=[CH:17][C:5]([C:6]([C:8]2[CH:16]=[CH:15][CH:14]=[CH:13][C:9]=2[C:10]([OH:12])=[O:11])=[O:7])=[CH:4][C:3]=1[N+:19]([O-:21])=[O:20].Cl.C([O:25][C:26](=[O:29])[CH2:27][NH2:28])C.[OH-].[K+].Cl>>[C:26]([CH2:27][NH:28][C:2]1[CH:18]=[CH:17][C:5]([C:6]([C:8]2[CH:16]=[CH:15][CH:14]=[CH:13][C:9]=2[C:10]([OH:12])=[O:11])=[O:7])=[CH:4][C:3]=1[N+:19]([O-:21])=[O:20])([OH:29])=[O:25]A suspension of 2-(4-chloro-3-nitrobenzoyl)benzoic acid (0.31 g 1.00 mmol) and glycine ethyl ester hydrochloride (0.69 g, 5.00 mmol) in a solution of 4M aqueous potassium hydroxide (3.8 mL, 15.0 mmol) was heated to 90° C. for 15 hours. The reaction mixture was cooled to room temperature and it was treated with 2M aqueous hydrochloric acid to adjust the pH to ˜5. It was partitioned with ethyl acetate (50 mL) and the organic layer was washed with brine and dried over anhydrous sodium sulfate. Filtration and concentration of the solvent gave 2-({4-[(carboxymethyl)amino]-3-nitrophenyl}carbonyl)benzoic acid (0.26 g, 76% yield) as a white residue. MS (EI) for C16H12N2O7: 342 (M−).
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