Summary
1-Alkylpyrano[3,4-b]indol-3-ones3 react via a Diels-Alder step with an aryne or N-phenylmaleimide to furnish the new [b]annellated carbazoles4–10 in a one-pot process. In an analogous procedure, the in situ generated N-benzoylindole-2,3-quinodimethane (13) reacted with quinones to furnish the dioxocarbazoles14–16. Compounds4–8 and14–16 with a coplanar skeleton are members of a class of potential DNA intercalators, as has been shown for5 and8 by X-ray structural analysis. On the basis of the geometries determined by X-ray crystallography, the intercalative binding of these molecules with a Watson-Crick mini-helix was predicted by molecular modeling methods.
Zusammenfassung
1-Alkylpyrano[3,4-b]indol-3-one3 reagieren über einen Diels-Alder-Schritt mit Arin oder N-Phenylmaleinimid zu [b]annellierten Carbazolen4–10 in einer Einstufenreaktion. In analoger Weise reagiert ein in situ erzeugtes N-Benzoylindol-2,3-chinodimethan13 mit Chinonen zu den Dioxocarbazolen14–16. Die Verbindungen4–8 und14–16 gehören infolge ihrer coplanaren Struktur zur Klasse potentieller DNA-Interkalatoren. Auf der Basis von Röntgenstrukturanalysen von5 und8 wird die interkalative Bindung mit einer Watson-Crick Minihelix durch Molecular Modeling vorhergesagt.
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Dräger, M., Haber, M., Erfanian-Abdoust, H. et al. New potential DNA intercalators of the carbazole series from indole-2,3-quinodimethanes: Synthesis, crystal structure, and molecular modeling with a watson-crick mini-helix. Monatsh Chem 124, 559–576 (1993). https://doi.org/10.1007/BF00819524
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DOI: https://doi.org/10.1007/BF00819524