ClC1C=CC=C(C(OO)=[O:9])C=1.[NH:12]1[C:16]2=[N:17][CH:18]=[CH:19][CH:20]=[C:15]2[CH:14]=[CH:13]1.CO>ClCCl>[NH:12]1[C:16]2=[N+:17]([O-:9])[CH:18]=[CH:19][CH:20]=[C:15]2[CH:14]=[CH:13]1539.7 g (2.35 mol) of 3-chloroperbenzoic acid are dissolved in 6.11 l of dichloromethane, and water that separates off is removed. The organic phase is dried over sodium sulfate and cooled to 0° C. A solution of 163 g (1.38 mol) of 1H-pyrrolo[2,3-b]pyridine in 1.00 l of dichloromethane is then added, and the temperature is allowed to increase to room temperature. After 2 hours, sufficient methanol to re-dissolve the precipitate formed is added. The mixture is filtered through silica gel (mobile phase: dichloromethane/methanol 95:5) and the product fractions are dried after concentration under high vacuum.
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