Potassium Hydroxide → 4-Chloro-1-ethyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid

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Reaction Steps

A solution of ethyl 4-chloro-1-ethyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylate (0.013 mol) (example 3) in dioxane is treated with potassium hydroxide (0.13 mol in 30 ml water) solution. The reaction mixture is stirred for about 3-4 hrs and concentrated under reduced pressure. It is acidified with hydrochloric acid to pH of about 3-4, extracted with ethyl acetate, washed with brine and dried under vacuo

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