反应详情

In 5 ml of water was dissolved 0.97 g of sodium hydroxide, whereto 100 ml of ethanol was added. Thereto was added a solution of 8.0 g of ethyl 3-[3-(4-fluorophenyl)-1H-pyrazolo[3,4-b]pyridin-1-yl]phenoxyacetate dissolved in 60 ml of dioxane while stirring. After the mixture was stirred at room temperature for 4 hours, about 500 ml of water was added thereto and the mixture was neutralized with dilute hydrochloric acid. The resulting crystals were collected by filtration and recrystallized from dioxane to give 4.8 g of 3-[3-(4-fluorophenyl)-1H-pyrazolo[3,4-b]pyridin-1-yl]phenoxyacetic acid, m.p. 225°-226° C.

1. additionwas added
2. stirringAfter the mixture was stirred at room temperature for 4 hours
3. filtrationThe resulting crystals were collected by filtration
4. customrecrystallized from dioxane