The title compound, C13H11NO2, crystallizes with two molecules in the asymmetric unit. The crystal packing is stabilized by N—H⋯O hydrogen bonds, which link the molecules into chains along [10], and weak C—H⋯O interactions.
In the title molecule, C 16 H 19 NO 2 , all the non-hydrogen atoms except two of the C atoms of the tert-butyl group lie on a crystallographic mirror plane. No classical hydrogen bonds are observed. The crystal packing is influenced by weak -and C-HÁ Á Á interactions.
Structure descriptionWe report herein the crystal structure of the title compound, which confirms the previously assigned structure in which it was envisioned that the coupling of an indole with a protected hydroxyl benzaldehyde appendage would install the required vinyl group found in the target molecules Prenostodione, Scytonemin and Nostodione (Macor et al., 1989;Badenock et al., 2013). As such, and in preparation for the coupling, commercially available 1,2,3,4-tetrahydrocyclopenta [b]indole was converted to the N-BOC derivative using a standard protection protocol in 87% yield. All the atoms except C15 (see Fig. 1) lie on a crystallographic mirror plane: the second methyl group outside the mirror plane is symmetry related and generates the third methyl group in the tertbutyl group.In the crystal, the molecules are in parallel layers alternately inverted along the c axis, parallel to the ac plane ( Fig2. 2 and 3). The crystal packing is influenced by weak -[Cg1-Cg1 and Cg1-Cg2; Cg1-Cg1 = 3.8718 (5) Å and Cg1-Cg2
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