反应详情

温度

60 °C

To a suspension of methyl 3-(2-chloro-4-(1-propoxy)benzyl)-2,7-dimethyl-3H-imidazo[4,5-b]pyridine-5-carboxylate (475 mg) in 1,4-dioxane was added 1N aqueous sodium hydroxide solution, and the mixture was heated to 60° C. and stirred for 30 min. It was air cooled and adjusted to pH 4 by dropwise addition of 1N hydrochloric acid. Water (25 ml) was added and the mixture was stirred at room temperature. The precipitated crystals were collected by filtration and dried under reduced pressure at 60° C. Thereto was added acetonitrile (3 ml) and the mixture was heated and stirred at room temperature. The crystals were collected by filtration and dried under reduced pressure at 60° C. to give 3-(2-chloro-4-(1-propoxy)benzyl)-2,7-dimethyl-3H-imidazo[4,5-b]pyridine-5-carboxylic acid as thin yellow crystals (426 mg).

1. temperaturecooled
2. stirringthe mixture was stirred at room temperature
3. filtrationThe precipitated crystals were collected by filtration
4. customdried under reduced pressure at 60° C
5. additionThereto was added acetonitrile (3 ml)
6. temperaturethe mixture was heated
7. stirringstirred at room temperature
8. filtrationThe crystals were collected by filtration
9. customdried under reduced pressure at 60° C.