反应详情

温度

25 °C

To a mixture of 4-[(3-nitro-benzylidene)-amino]-benzonitrile (21 g, 84 mmol) and ytterbium(III) triflate hydrate (5.21 g, 8.4 mmol) in dry tetrahydrofuran (150 mL) at 25° C. was added isobutyraldehyde (8.4 mL, 92 mmol) and water (1.5 mL, 84 mmol) dropwise. The reaction mixture was stirred at 25° C. for 15 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 4-hydroxy-3,3-dimethyl-2-(3-nitro-phenyl)-1,2,3,4-tetrahydro-quinoline-6-carbonitrile (25 g, 92%) as a light yellow oil: LC/MS m/e calcd for C18H17N3O3 (M+H)+: 324.35, observed: 324.1.

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