[NH2:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH2:8]([O:10][CH:11](O)[C:12]([F:15])([F:14])[F:13])[CH3:9]>C(O)C.O.C1(C)C=CC(S(O)(=O)=O)=CC=1>[CH2:8]([O:10][CH:11]([NH:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1)[C:12]([F:15])([F:14])[F:13])[CH3:9]A solution of aniline (2 mL, 21.9 mmol), trifluoroacetaldehyde ethyl hemiacetal (2.6 mL, 21.9 mmol) and p-toluenesulfonic acid monohydrate (220 mg, 1.16 mmol) in ethanol (25 mL) was heated to reflux for 3 h under continuous stirring. The reaction mixture was cooled, the solvent was removed under reduced pressure and the residue was dissolved in EtOAc. The organic layer was washed with a saturated aqueous solution of sodium bicarbonate, dried over anhydrous sodium sulfate and the solvent was removed under reduced pressure to afford title compound 325 (4.16 g, crude) as a yellow oil which was used directly for the next step.
Wird geladen…
