Abstract
A solid-phase synthesis of benzimidazole N-oxides was developed while attempting to synthesize 1,5-benzodiazepine-2,4-diones. The key step of the synthesis involves the reduction of an arylnitro to a hydroxyamino intermediate which subsequently condenses with an internal carbonyl group to give a benzimidazole N-oxide. A library of nine benzimidazole N-oxides was prepared on SynPhase™ Lanterns using this reduction–cyclization methodology.
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