Hydrochloric Acid → 2-Chloro-3-methyl-1-oxo-1lambda~5~-pyridine

참여 물질

반응 단계

To a mixture of 2-chloro-3-methylpyridine (12.8 g, 100 mmol), urea hydrogen peroxide (19.8 g, 210 mmol) and dichloromethane (130 mL) was added dropwise anhydrous trifluoroacetic acid (28.2 mL, 200 mmol) at 0° C. The reaction was stirred for a further 1.5 hours, warmed to room temperature and then treated with 9% w/w aqueous sodium hydrosulfite (200 mL). The mixture was stirred for a further 15 minutes then 2N hydrochloric acid (50 ml) was added and the mixture was extracted with dichloromethane (2×120 mL). The combined extracts were washed with saturated aqueous sodium hydrogen carbonate (2×100 mL), dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to yield 2-chloro-3-methylpyridine 1-oxide as a yellow solid (11.45 g; 89% purity by UV).

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