Dimethylformamide → Ethyl 4-(hydroxymethyl)-2-[4-(trifluoromethyl)phenyl]-1,3-thiazole-5-carboxylate
反応式
Br[CH2:2][C:3]1[N:4]=[C:5]([C:13]2[CH:18]=[CH:17][C:16]([C:19]([F:22])([F:21])[F:20])=[CH:15][CH:14]=2)[S:6][C:7]=1[C:8]([O:10][CH2:11][CH3:12])=[O:9].CN(C=[O:27])C>FC(F)(F)C([O-])=O.[Ag+]>[OH:27][CH2:2][C:3]1[N:4]=[C:5]([C:13]2[CH:18]=[CH:17][C:16]([C:19]([F:22])([F:21])[F:20])=[CH:15][CH:14]=2)[S:6][C:7]=1[C:8]([O:10][CH2:11][CH3:12])=[O:9]参加物
4
実験手順
To a stirred solution of ethyl 4-(bromomethyl)-2-[4-(trifluoromethyl)phenyl]-1,3-thiazole-5-carboxylate (50g, 0.127moles, 1eq) in dry DMF (300ml) under a positive N2flow was added silver trifluoroacetate (42.02g, 0.191moles, 1.5eq) all at once as a solid. This was stirred at room temperature for 3.5hrs. The reaction was partitioned between ethyl ether (1.5L) and water (500ml). The phases were separated and the organic phase washed twice with water (500ml). After separation of the phases, the organic fraction was dried with Na2SO4, filtered and concentrated in vacuo. The crude trifluoroacetate product was used without characterization. Ethanol (300ml) was added and the reaction was refluxed for 10hrs. After cooling to room temperature the ethanol was removed in vacuo to yield 42g (100%) of the title compound. The product was used without purification.