Acta Cryst. (2004). E60, o2362-o2364  [ doi:10.1107/S1600536804029332 ]

Ethyl 2-amino-4-(4-methoxyphenyl)-7-methyl-5-oxopyrano[3,2-c]pyran-3-carboxylate

D.-Q. Shi, L.-H. Niu, X.-S. Wang, Q.-Y. Zhuang and Y. Zhang

Abstract: The title compound, C₁₉H₁₉NO₆, was synthesized by the reaction of 4-hydroxy-6-methylpyran-2-one and ethyl 4'-methoxy-2-cyanocinnamate in the presence of triethylbenzylammonium chloride in an aqueous medium. The pyranone ring is almost planar, while the fused pyran ring adopts a flattened boat conformation. The amino group is involved in both intra- and intermolecular N-HO hydrogen bonds.

Online 20 November 2004

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