Received 28 October 2010
In the title compound, C20H13NO, the indene ring is disordered over two sites with an occupancy ratio of 0.557 (2):0.443 (2). Both disordered components of indene are nearly perpendicular to the naphthalene ring system, making dihedral angles of 90.9 (2) and 85.0 (5)°. The five-membered ring of the 1H-pyrrol-2(3H)-one adopts an envelope conformation with the spiro C atom at the flap position. Intermolecular classical N-HO and weak C-HO hydrogen bonding is present in the crystal structure.
For the biological activity of spiro lactams, see: Tsuda et al. (2004); Chen et al. (2005). For the synthesis of the title compound, see: Ready et al. (2004); Schoemaker & Speckamp (1978).
Data collection: CrystalClear (Rigaku/MSC, 2001); cell refinement: CrystalClear; data reduction: CrystalStructure (Rigaku/MSC, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEPII (Johnson, 1976); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: XU5073 ).
This work was supported by the Medical Scientific Research Foundation of Guangdong Province (No. B107) and the Guangzhou Municipal Scientific and Technological Project, China (No. 2007 J1-C0251).
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