[F:1][C:2]1[C:7]([CH:8]2[CH2:12][NH:11][C:10](=[O:13])[CH2:9]2)=[CH:6][CH:5]=[CH:4][N:3]=1.I[CH3:15].[H-].[Na+]>CN(C=O)C.CCOC(C)=O>[F:1][C:2]1[C:7]([CH:8]2[CH2:12][N:11]([CH3:15])[C:10](=[O:13])[CH2:9]2)=[CH:6][CH:5]=[CH:4][N:3]=1To a solution of 4-(2-fluoropyridin-3-yl)pyrrolidin-2-one (0.254 g, 1.41 mmol) in DMF (5 mL) at 0° C. was added iodomethane (0.090 mL, 1.4 mmol) and sodium hydride (60% weight dispersion in mineral oil, 0.056 g, 1.4 mmol). The reaction mixture was stirred at 0° C. for 30 min, warmed to room temperature, and stirred for 30 min. The reaction mixture was diluted with EtOAc, quenched with water, and diluted with brine and water. The aqueous phase was extracted with EtOAc (6×) and the combined organic extracts were washed with brine (1×), dried over MgSO4, filtered, and concentrated. Purification by flash column chromatography on silica gel (50% to 100% EtOAc (10% MeOH) in hexanes) gave 4-(2-fluoropyridin-3-yl)-1-methylpyrrolidin-2-one (0.226 g, 1.16 mmol, 83% yield) as a pale yellow oil. MS (ESI, pos. ion) m/z: 195.1 (M+1).
読み込み中…
