反应详情

温度

25 °C

To a mixture of 2-(5-bromo-pyridin-3-yl)-4-hydroxy-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl ester (16 g, 39.5 mmol) and triethylsilane (40 mL) at 25° C. was added trifluoroacetic acid (20 mL) dropwise. The resulting mixture was stirred at 25° C. for 5 h. Then the reaction mixture was concentrated in vacuo and the residue was extracted with ethyl acetate (2×200 mL), washed with saturated aqueous sodium bicarbonate solution (2×100 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) (30% ethyl acetate/hexanes) to afford 2-(5-bromo-pyridin-3-yl)-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl ester (4.4 g, 28%) as a yellow solid: LC/MS m/e calcd for C19H21BrN2O2 (M+H)+: 390.30, observed: 390.9.

1. concentrationThen the reaction mixture was concentrated in vacuo
2. extractionthe residue was extracted with ethyl acetate (2×200 mL)
3. washwashed with saturated aqueous sodium bicarbonate solution (2×100 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) (30% ethyl acetate/hexanes)