反应详情

温度

25 °C

To a mixture of 2-(3-bromo-phenyl)-6-chloro-4-hydroxy-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-8-carboxylic acid methyl ester (6.4 g, 15 mmol) and triethylsilane (10 mL) at 25° C. was added trifluoroacetic acid (10 mL) dropwise. The resulting mixture was stirred at 25° C. for 1 h. Then the reaction mixture was concentrated in vacuo and the residue was extracted with ethyl acetate (2×100 mL), washed with saturated aqueous sodium bicarbonate solution (2×50 mL), dried over anhydrous sodium sulfate and concentrated in vacuo. Purification on flash silica gel chromatography (silica gel from QingDao, 200-300 mesh, glass column from Shanghai SD company)(5% ethyl acetate/hexanes) to afford 2-(3-bromo-phenyl)-6-chloro-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-8-carboxylic acid methyl ester (2.51 g, 41%) as a white solid: LC/MS m/e calcd for C19H19BrClNO2 M+: 408.7, observed: 408.8.

1. concentrationThen the reaction mixture was concentrated in vacuo
2. extractionthe residue was extracted with ethyl acetate (2×100 mL)
3. washwashed with saturated aqueous sodium bicarbonate solution (2×50 mL)
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated in vacuo
6. customPurification on flash silica gel chromatography (silica gel from QingDao, 200-300 mesh, glass column from Shanghai SD company)(5% ethyl acetate/hexanes)