Ethyl 3-bromo-2-oxo-4-phenylbutanoate → Ethyl 5-benzyl-2-(2,5-difluorophenyl)thiazole-4-carboxylate
反応式
Br[CH:2]([CH2:10][C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)[C:3](=O)[C:4]([O:6][CH2:7][CH3:8])=[O:5].[F:17][C:18]1[CH:26]=[CH:25][C:24]([F:27])=[CH:23][C:19]=1[C:20](=[S:22])[NH2:21]>CO>[CH2:10]([C:2]1[S:22][C:20]([C:19]2[CH:23]=[C:24]([F:27])[CH:25]=[CH:26][C:18]=2[F:17])=[N:21][C:3]=1[C:4]([O:6][CH2:7][CH3:8])=[O:5])[C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1参加物
4
実験手順
To a solution of ethyl 3-bromo-2-oxo-4-phenylbutanoate (13.8 g, 48.4 mmol) in MeOH (161 mL) was slowly added 2,5-difluorobenzothioamide (8.38 g, 48.4 mmol) at room temperature. The reaction mixture was then refluxed for overnight. After cooled down, white precipitate was filtered, washed by cold ethanol and dried. A mixture of methyl 5-benzyl-2-(2,5-difluorophenyl)thiazole-4-carboxylate and ethyl 5-benzyl-2-(2,5-difluorophenyl)thiazole-4-carboxylate (10.5 g, 61%) was obtained as white solid. LC/MS (uplc): MW 346.1, 1.21 min for methyl ester; 360.1, 1.27 min for ethyl ester.