Chloroacetone → 2-Methylimidazo[1,2-a]pyridin-8-ol

A mixture of 2-amino-3-hydroxypyridine (1,000 g) and chloroacetone (845 g) in 7.57 liters of ethanol was heated under reflux for 20 hrs. Most of the ethanol was removed by distillation and the residual material was dissolved in 7.57 liters of water. This solution was extracted four times with 1.2 liter portions of dichloromethane. The combined extracts were washed with 1 liter of water and this was combined with the aqueous solution. This solution was then adjusted to pH 11.5-12 with 850 ml of 50%sodium hydroxide. This basic solution was extracted three times with 1.2 liters of dichloromethane. The combined dichloromethane extracts were washed with 1 liter of H2O and this was added to the basic solution.This solution was chilled in an ice bath and the pH adjusted to 7 with 1.45liters of 6 N hydrochloric acid. After standing overnight, the product was collected, washed with water, and dried. The product was recrystallized from dichloromethane/methanol to give the intermediate.

1. temperaturewas heated
2. temperatureunder reflux for 20 hrs
3. customMost of the ethanol was removed by distillation
4. dissolutionthe residual material was dissolved in 7.57 liters of water
5. extractionThis solution was extracted four times with 1.2 liter portions of dichloromethane
6. washThe combined extracts were washed with 1 liter of water
7. extractionThis basic solution was extracted three times with 1.2 liters of dichloromethane
8. washThe combined dichloromethane extracts were washed with 1 liter of H2O
9. additionthis was added to the basic solution.This solution
10. temperaturewas chilled in an ice bath
11. customthe product was collected
12. washwashed with water
13. customdried
14. customThe product was recrystallized from dichloromethane/methanol
15. customto give the intermediate

ORDレコード

ord-0ba0a31998394b1c9675876014e6eb27

出典データセット

uspto-grants-1984_05

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US04450164