[CH2:1]([N:8]1[C:13]([CH3:14])=[CH:12][C:11]([OH:15])=[CH:10][C:9]1=[O:16])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH2:17](Br)[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1.[OH-].[Na+].Cl>[Cl-].C([N+](CC)(CC)CC)C1C=CC=CC=1.ClCCl>[CH2:1]([N:8]1[C:13]([CH3:14])=[CH:12][C:11]([O:15][CH2:17][C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)=[CH:10][C:9]1=[O:16])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=11-benzyl-4-hydroxy-6-methylpyridin-2(1H)-one (10 mmol, 2.15 g), dichloromethane (100 mL), benzylbromide (11 mmol, 1.88 g), sodium hydroxide (2.5 N, 20 mmol, 8 mL), and benzyltriethylammonium chloride (0.5 g) were vigorously stirred at room temperature for 16 h. Hydrochloric acid (1 N) was added until the mixture produced an acidic reaction to pH paper. The mixture was then extracted with ethyl acetate (3×50 mL). The combined organic extracts were washed with brine, dried over magnesium sulfate, filtered, and concentrated. The product was obtained by flash chromatography eluting with ethyl acetate:hexanes (1:2). The appropriate fractions were concentrated to a clear oil. (1.3 g, 43%): 1H NMR (DMSO-d6/300 MHz) δ: 7.4-7.1 (m, 10H), 6.0-5.9 (m, 2H), 5.2 (s, 2H), 5.1 (s, 2H), 2.2 (s, 3H). ES HRMS m/z 306.147 (M+H, C20H19NO2 requires 306.149).
読み込み中…
