Cyclopropapyrrolo[1,2-a]indoles

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Abstract
Decomposition of the tosylhydrazones (3), prepared from indole-2-carbaldehyde in two steps, gives the cyclopropapyrrolo[1,2-a]indoles (4), novel analogues of the mitomycin antitumour antibiotics, by an intramolecular cycloaddition reaction.