[BH4-].[Na+].[CH3:3][N:4]1[C:13]2[C:8](=[CH:9][CH:10]=[CH:11][CH:12]=2)[C:7](=[O:14])[C:6]([CH3:16])([CH3:15])[C:5]1=[O:17].Cl>CCO>[OH:14][CH:7]1[C:8]2[C:13](=[CH:12][CH:11]=[CH:10][CH:9]=2)[N:4]([CH3:3])[C:5](=[O:17])[C:6]1([CH3:16])[CH3:15]NaBH4 (excess amount) is added to a solution of 1,3,3-Trimethyl-1H-quinoline-2,4-dione (330 mg, 1.62 mmol) in EtOH (8 mL) at 0° C. The resulting mixture is slowly warmed up to room temperature. After 1 h, HCl (10%, 3 mL) is added dropwise. The solvent is removed under vacuum, the residue is dissolved into ether and washed with water, brine, and dried over anhydrous Na2SO4. After concentration, the title compound is yielded (275 mg, 82% yield).
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