反应详情

温度

40 °C

Ethyl 7-(2-methoxyethoxy)imidazo[1,2-a]pyridine-3-carboxylate (6.0 6 g; 22.9 mmol) was mixed with tetrahydrofuran (225 mL), ethanol (110 mL) and water (55 mL). Lithium hydroxide monohydrate (0.962 g; 22.9 mmol) was added. The mixture was stirred under an atmosphere of nitrogen and heated at 40° C. for 22 hours. The mixture was allowed to cool and then concentrated under reduced pressure to give a yellow gum. Water (50 mL) was added and the mixture was stirred until homogeneous. Hydrochloric acid (2N) was added with stirring to adjust to pH3. The mixture was cooled with an ice/water bath. The resulting precipitate was collected by filtration and washed with a small amount of water (10 mL). The material was dried under vacuum to give 7-(2-methoxyethoxy)imidazo[1,2-a]pyridine-3-carboxylic acid as a white solid (4.90 g).

1. temperatureto cool
2. concentrationconcentrated under reduced pressure
3. customto give a yellow gum
4. stirringthe mixture was stirred until homogeneous
5. stirringwith stirring
6. temperatureThe mixture was cooled with an ice/water bath
7. filtrationThe resulting precipitate was collected by filtration
8. washwashed with a small amount of water (10 mL)
9. customThe material was dried under vacuum