反应详情

温度

25 °C

To a mixture of (3-nitro-benzylidene)-(4-trifluoromethyl-phenyl)-amine (5.88 g, 20 mmol) and ytterbium(III) triflate hydrate (1.24 g, 2 mmol) in dry tetrahydrofuran (50 mL) at 25° C. was added isobutyraldehyde (2 mL, 22 mmol) and water (0.36 mL, 20 mmol) dropwise. The reaction mixture was stirred at 25° C. for 72 h. Then the reaction mixture was concentrated in vacuo and the residue was extracted with ethyl acetate (2×200 mL), washed with brine, dried over anhydrous sodium sulfate and concentrated in vacuo to afford 3,3-dimethyl-2-(3-nitro-phenyl)-6-trifluoromethyl-1,2,3,4-tetrahydro-quinolin-4-ol (7.1 g, 96%) as a light yellow oil: LC/MS m/e calcd for C18H17F3N2O3 (M+H)+: 367.34, observed: 349.0.

1. concentrationThen the reaction mixture was concentrated in vacuo
2. extractionthe residue was extracted with ethyl acetate (2×200 mL)
3. washwashed with brine
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated in vacuo