Research Article: rac-Dimethyl 5-oxo-2-[(2,4,4-trimethyl­pentan-2-yl)amino]-4,5-dihydro­pyrano[3,2-c]chromene-3,4-dicarboxyl­ate

Date Published: July 01, 2012

Publisher: International Union of Crystallography

Author(s): S. Antony Inglebert, Yuvaraj Arun, K. Sethusankar, Paramasivam T. Perumal.


The title compound, C24H29NO7, is asymmetric with a chiral centre located in the pyran ring and crystallizes as a racemate. The coumarin ring system and the fused pyran ring make a dihedral angle of 10.46 (8)°. A short intra­molecular N—H⋯O hydrogen bond between the amino group and the vicinal carbonyl group generates an S(6) ring. Inter­molecular C—H⋯O inter­actions contribute to the stability of the crystal structure.

Partial Text

For the biological activity of pyran­ocoumarin compounds, see: Kawaii et al. (2001 ▶); Goel et al. (1997 ▶); Xu et al. (2006 ▶). For a similar compound, see: Inglebert et al. (2011 ▶). For bond-angle distortions, see: Chinnakali et al. (1998 ▶); Kumar et al. (1997 ▶). For graph-set notation, see: Bernstein et al. (1995 ▶).




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