Hydrochloric Acid → 6-chloro-1H-pyrrolo[2,3-b]pyridine-4-carboxylic acid

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Reaction Steps

In a 100 ml round-bottomed flask, 7.5 ml of a 1M aqueous solution of lithium hydroxide are added, at ambient temperature, to a suspension of 527 mg of 6-chloro-1H-pyrrolo[2,3-b]pyridine-4-carboxylic acid methyl ester obtained according to the preceding stage, in 15 ml of methanol. After stirring for 2.5 hours at ambient temperature, 7.5 ml of 1N hydrochloric acid are added dropwise. After stirring for ½ hour, the solid is filtered off, washed with 25 ml of water and dried. 475 mg of 6-chloro-1H-pyrrolo[2,3-b]pyridine-4-carboxylic acid are obtained in the form of a beige solid, the characteristics of which are the following:

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