[Br:1][C:2]1[CH:11]=[C:10]2[C:5]([C:6](=[O:21])[CH:7](C(OCC)=O)[C:8](=[O:15])[N:9]2[CH:12]([CH3:14])[CH3:13])=[CH:4][CH:3]=1.[OH-].[Na+].Cl>CN1C(=O)CCC1>[Br:1][C:2]1[CH:11]=[C:10]2[C:5]([C:6]([OH:21])=[CH:7][C:8](=[O:15])[N:9]2[CH:12]([CH3:13])[CH3:14])=[CH:4][CH:3]=1A suspension of ethyl 7-bromo-2,4-dioxo-1-(propan-2-yl)-1,2,3,4-tetrahydroquinoline-3-carboxylate (1.5 g, 4.23 mmol) in sodium hydroxide (2M solution, 32 mL, 64 mmol) is heated to reflux. The reaction medium becomes homogeneous and, after 3 hours, a suspension is once again observed. 6 mL of NMP are added to homogenize, and the resulting mixture is than refluxed for 12 hours. The solution cooled to room temperature is poured into 6M hydrochloric acid solution to give a white precipitate, which is filtered off. After rinsing with water and drying the precipitate under vacuum, 1.1 g of a white solid are obtained (yield: 91%).
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