反应详情

温度

160 °C

To a solution of 5-(6-chloro-pyridin-3-yl)-5-cyano-2-hydroxy-cyclohex-1-enecarboxylic acid methyl ester (4.2 g, 14 mmol) in DMSO (15 mL) was added sodium chloride (090 g, 16 mmol) and water (0.77 mL). The reaction mixture was heated at 160° C. for 6 hours. The reaction mixture was then cooled to room temperature and poured into water (50 mL). The aqueous layer was extracted with diethyl ether (3×250 mL). The combined organic layer was dried over sodium sulfate, filtered and concentrated under reduced pressure. The residue obtained was purified by column chromatography on silica gel to afford 1-(6-chloro-pyridin-3-yl)-4-oxo-cyclohexanecarbonitrile (1.7 g, 52%). 1H NMR (400 MHz, CDCl3) δ ppm 8.59 (s, 1 H), 7.83 (dd, J=8.4, 2.2 Hz, 1 H), 7.44 (d, J=8.5 Hz, 1 H), 2.89-2.98 (m, 2 H), 2.60-2.66 (m, 2 H), 2.48-2.54 (m, 2 H), 2.25-2.33 (m, 2 H).

1. temperatureThe reaction mixture was then cooled to room temperature
2. extractionThe aqueous layer was extracted with diethyl ether (3×250 mL)
3. dry with materialThe combined organic layer was dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe residue obtained
7. customwas purified by column chromatography on silica gel