[OH:1][C:2]1[CH:7]=[CH:6][C:5]([C:8](=O)/[CH:9]=[CH:10]/[C:11]2[CH:12]=[C:13]([CH:19]=[CH:20][CH:21]=2)[O:14][CH2:15][C:16]([OH:18])=[O:17])=[CH:4][C:3]=1[CH3:23].[NH2:24][C:25]([NH2:27])=[O:26]>Cl.O1CCOCC1>[OH:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:9]=[C:10]([C:11]3[CH:12]=[C:13]([O:14][CH2:15][C:16]([OH:18])=[O:17])[CH:19]=[CH:20][CH:21]=3)[NH:24][C:25](=[O:26])[N:27]=2)=[CH:4][C:3]=1[CH3:23](E)-2-(3-(3-(4-hydroxy-3-methylphenyl)-3-oxoprop-1-enyl)phenoxy)acetic acid (15.0 g, 48.0 mmol) and urea (14.4 g, 0.24 mol) were suspended in 200 mL of 4N HCl solution in dioxane, and the reaction mixture was heated to reflux overnight, then cooled to room temperature. The resulted mixture was concentrated in vacuo to remove dioxane. The residues were suspended in 150 mL of 2-propanol and heated in a 90° C. oil bath for 10 minutes, then cooled down to room temperature. The suspension was filtered and washed with 50 mL of 2-propanol and dried in the air. 9.2 g (54%) of the desired ({3-[6-(4-hydroxy-3-methylphenyl)-2-oxo-2,3-dihydropyrimidin-4-yl]phenyl}oxy)acetic acid were obtained. 1H NMR (400 MHz, DMSO-d6): 10.39 (s, 1H), 8.00 (s, 1H), 7.90 (m, 1H), 7.75 (m, 1H), 7.65 (s, 1H), 7.40-7.55 (m, 2H), 7.16 (m, 1H), 6.95 (m, 1H), 4.80 (s, 2H), 2.20 (s, 3H). MS (EI) for C19H16N2O5: 353 (MH+).
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