Water → 4-cyclohexylamino-1-ethyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid

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Reaction Steps

Sodium hydroxide solution (4.09 gm in 20 ml water) was added to a solution of ethyl 4-(cyclohexylamino)-1-ethyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylate (9.32 gm, 0.0294 mole) (example 4) in ethanol. The reaction mixture was stirred for about 14 h at room temperature and then warmed for about 1 h at 60° C. Water was added and the reaction mixture was extracted with ethyl acetate. Aqueous layer was acidified by using hydrochloric acid (2N) to pH of about 4-5. White solid, which was obtained, was filtered and dried in vacuo.

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