反应详情

To a stirred solution of pyrazolo[3,4-b]pyridin-1-yl-acetic acid ethyl ester (210 mg, 1.02 mmol) (Preparation 133) in THF (4 mL) and water (1 mL) at 0° C. was added LiOH.H2O (129 mg, 3.06 mmol). The reaction mixture was stirred at room temperature for 2 hours. The pH was of the mixture was adjusted to pH 4 with 2 N aqueous hydrochoric acid and extracted with 20% isopropanol in dichloromethane (8×5 mL). The combined organics were dried over sodium sulfate, filtered and concentrated under reduced pressure to afford the title compound as an off-white solid in 40% yield, 70 mg.

1. extractionextracted with 20% isopropanol in dichloromethane (8×5 mL)
2. dry with materialThe combined organics were dried over sodium sulfate
3. filtrationfiltered
4. concentrationconcentrated under reduced pressure