1H-Pyrrolo(2,3-b)pyridine → 7-aza-1H-indole N-oxide

Participants

Reaction Steps

To 1H-pyrrolo[2,3-b]pyridine (94, 3.0 g, 25.3 mmol) dissolved in 175 ml, of diethyl ether was added m-CPBA (1.5 equiv) in portions over 30 minutes with vigorous stirring. The solution turned yellow, and precipitates formed. After two hours the solid was collected, washed with 2×50 mL of ether, and recrystallized from acetone:ether. Yield was approximately 125% due to contaminating acid. This crude material was carried through to the next step.

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