Phosphorus oxychloride → 4-Bromo-7-chloro-1H-pyrazolo[3,4-c]pyridine

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Reaction Steps

Phosphorus oxychloride (2 ml) was added to 4-bromo-1H-pyrazolo[3,4-c]pyridine 6-oxide (148 mg) obtained in the 1st step, followed by stirring at room temperature for 3 hours. The reaction solution was poured into water, followed by extraction with ethyl acetate. An insoluble precipitate was removed and then the solvent was distilled away under reduced pressure. A yellow solid of 4-bromo-7-chloro-1H-pyrazolo[3,4-c]pyridine (126 mg) was thus obtained.

Provenance & Evidence