反应详情

To a solution of 5-bromo-2-carboxypyridine 1-oxide (19.6 g) in methanol (300 mL) was added dropwise thionyl chloride (37.1 g) at 0° C., and the mixture was heated under reflux for 1 hr. The reaction mixture was concentrated under reduced pressure and the residue was washed with ethyl acetate to give the title compound (22.0 g) as white crystals. This compound was used for the next step without further purification.

1. temperaturethe mixture was heated
2. temperatureunder reflux for 1 hr
3. concentrationThe reaction mixture was concentrated under reduced pressure
4. washthe residue was washed with ethyl acetate