ONC(=O)C1C=CC(OCC[N:13]2[C:19](=[O:20])[C:18]3[CH:21]=[CH:22][CH:23]=[N:24][C:17]=3[O:16][C:15]3[CH:25]=[CH:26][CH:27]=[CH:28][C:14]2=3)=CC=1.[OH-].[Na+].O>CN(C=O)C>[N:24]1[C:17]2[O:16][C:15]3[CH:25]=[CH:26][CH:27]=[CH:28][C:14]=3[NH:13][C:19](=[O:20])[C:18]=2[CH:21]=[CH:22][CH:23]=1Title compound 430 (3.65 g, 14.7 mmol) was dissolved in DMF (25.0 mL) and sodium hydroxide powder (0.706 g, 17.7 mmol) was added. The reaction mixture was stirred at 130° C. for 5 hours. The mixture was cooled down to room temperature and ice cooled water was added. The precipitate was filtered. The solid was triturated in ethanol to afford title compound 431 (1.798 g, 58%) as a white solid. 1H NMR (DMSO-d6) δ (ppm): 10.75 (s, 1H), 8.50 (dd, J=4.8, 2.1 Hz, 1H), 8.27 (dd, J=7.6, 2.0 Hz, 1H), 7.46 (dd, J=7.5, 4.8 Hz, 1H), 7.34 (dd, J=7.8, 1.2 Hz, 1H), 7.25-7.14 (m, 3H). MS (m/z): 213.2 (M+H).
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