2,2,9-Trimethyl-2,3-dihydropyrano[2,3-a]carbazol-4-(11H)-one

The title compound, C18H17NO2, was prepared from 1-hydroxy-7-methylcarbazole and 3,3-dimethylacrylic acid with trifluoroacetic acid as the cyclization catalyst. The molecules contain an essentially planar 6-methylindole unit. The second aromatic ring is significantly bent away from the plane of this unit, with maximum deviations of 0.171 (1) and 0.185 (1) Å for two of the C atoms. In the crystal structure, there are neither N—H...O hydrogen bonds nor π–π stacking between the aromatic sections of neighboring molecules. There is only one weak C—H...O hydrogen bond and a number of weak C—H...π interactions.

Abstract licence: CC BY

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