反应详情

温度

-5 °C

In a solution of 12.3 g of conc. hydrochloric acid, 45 ml of water and 45 ml of methanol was dissolved 20 g of 6-isobutenylimidazo[1,2-a]pyridine. The solution was cooled to -5° C. Ozone was introduced to the solution at -5° to 0° C. for 4 hours. The endpoint of the reaction was confirmed by thin layer chromatography. After completion of the reaction, a solution of 30.6 g of sodium sulfite in 160 ml of water was dropwise added under cooling at such a rate that the temperature did not exceed 20° C. Next, 22 g of sodium bicarbonate and an appropriate amount of salt were added as solids and the mixture was extracted with chloroform. The chloroform extract was washed twice with a saturated saline solution. After drying over magnesium sulfate, chloroform was removed by distillation under reduced pressure. The residue was purified by distillation under reduced pressure to obtain 14.2 g (70.5%) of 1 -(imidazo[1,2-a]pyridin-6-yl)-2-propanone.

1. customAfter completion of the reaction
2. temperatureunder cooling at such a rate that the temperature
3. customdid not exceed 20° C
4. extractionthe mixture was extracted with chloroform
5. extractionThe chloroform extract
6. washwas washed twice with a saturated saline solution
7. dry with materialAfter drying over magnesium sulfate, chloroform
8. customwas removed by distillation under reduced pressure
9. distillationThe residue was purified by distillation under reduced pressure