反应详情

40% meta-chloroperbenzoic acid (13.5 g, 31.4 mmol) was added at ambient temperature to a solution of 2-chloro-4-methyl-pyridine (2.0 g, 1.5 mmol) in chloroform (20 mL) and heated at reflux for 24 h. After allowing to cool, the mixture was washed with water followed by sodium bicarbonate solution. The separated organic phase was further washed with water and brine, dried over anhydrous sodium sulfate and concentrated to give a residue which was purified by column chromatography over silica gel (60-120 mesh) using 10% methanol in ethyl acetate as eluent to afford 2-chloro-4-methyl-pyridine 1-oxide (1.0 g, 45%) as a deep brown oily liquid.

1. temperatureheated
2. temperatureat reflux for 24 h
3. temperatureto cool
4. washthe mixture was washed with water
5. washThe separated organic phase was further washed with water and brine
6. dry with materialdried over anhydrous sodium sulfate
7. concentrationconcentrated
8. customto give a residue which
9. customwas purified by column chromatography over silica gel (60-120 mesh)