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Potassium hydroxide (441 mg, 11.04 mmol) was added to a solution of ethyl 7-cyano-3-mesityl-2,5-dimethylpyrazolo[1,5-a]pyrimidin-6-carboxylate (800 mg, 2.21 mmol) in ethanol (15 mL), followed by heating under reflux for two hours. The reaction mixture was evaporated, water was added. Under ice-cooling, 2N hydrochloric acid was added to adjust the pH of the mixture to pH 1. The mixture was extracted with ethyl acetate, and the organic layer was washed with brine, dried over anhydrous magnesium sulfate and evaporated, to give the title compound (780 mg).

1. temperatureby heating
2. temperatureunder reflux for two hours
3. customThe reaction mixture was evaporated
4. additionwater was added
5. temperatureUnder ice-cooling
6. addition2N hydrochloric acid was added
7. extractionThe mixture was extracted with ethyl acetate
8. washthe organic layer was washed with brine
9. dry with materialdried over anhydrous magnesium sulfate
10. customevaporated