反应详情

To a stirred, cooled (-20° C.) solution of 3,3,3-trifluoro-2-hydroxy-2-methylpropanoic acid (1.58 g, 10 mmol) in N,N-dimethylcetamide (15 mL) was added thionyl chloride (1.25 g, 10.5 mmol) and the mixture stirred at -20° to -10° C. for 1 hour. 4-Amino-3'-fluorobenzophenone (1.44 g, 6.7 mmol) was added in one portion and the reaction mixture stirred at room temperature overnight. The mixture was poured into water to yield an oil and a cloudy solution. The cloudy solution was decanted from the oil and filtered by suction through a pad of Celite. The Celite pad was washed with methylene chloride and the solution added to a solution of the gum in methylene chloride. The solution was dried (MgSO4), filtered and the solvent removed in vacuo. The resulting oil was chromatographed on silica gel (ethyl ether), the proper fractions combined and the solvent removed to yield an oil. The oil was dissolved in 50 mL of hexane containing enough methylene chloride to give a clear solution and the solution concentrated on a steambath until the solution became cloudy. The resulting pale yellow solid was collected by filtration and dried to yield 1.51 g (63%) of N-[4-(3-fluorophenylcarbonyl)phenyl]-3,3,3-trifluoro-2-hydroxy-2-methylproanamide, mp 121.5°-3° C. 1H-NMR (250 MHz, d6-DMSO): 1.59 (s, 3H, CH3) 3.32 (s, 1H, OH) 7.46-7.60 (m, 4H, aromatic) 7.75 (d, 2H, J=9.1 Hz aromatic) 7.96 (d, 2H, J=8.2 Hz, aromatic) 10.33 (s, 1H, NH). MS (CI, CH4): 356 (M+1).

1. stirringthe reaction mixture stirred at room temperature overnight
2. customto yield an oil
3. customThe cloudy solution was decanted from the oil
4. filtrationfiltered by suction through a pad of Celite
5. washThe Celite pad was washed with methylene chloride
6. additionthe solution added to a solution of the gum in methylene chloride
7. dry with materialThe solution was dried (MgSO4)
8. filtrationfiltered
9. customthe solvent removed in vacuo
10. customThe resulting oil was chromatographed on silica gel (ethyl ether)
11. customthe solvent removed
12. customto yield an oil
13. customto give a clear solution
14. concentrationthe solution concentrated on a steambath until the solution
15. filtrationThe resulting pale yellow solid was collected by filtration
16. customdried
17. customto yield 1.51 g (63%) of N-[4-(3-fluorophenylcarbonyl)phenyl]-3,3,3-trifluoro-2-hydroxy-2-methylproanamide, mp 121.5°-3° C