Research Article: Methyl 2,2-dimeth­oxy-8-oxo-1-oxaspiro­[4.5]deca-6,9-diene-3-carboxyl­ate

Date Published: April 01, 2012

Publisher: International Union of Crystallography

Author(s): Yongbing Lou.


In the title mol­ecule, C13H16O6, the cyclo­hexa-1,4-diene ring adopts a flat boat conformation (r.m.s. deviation from planarity = 0.060 Å) and the five-membered tetra­hydro­furan ring adopts an envelope conformation with the carboxyl group-substituted C atom as the flap. The dihedral angle at the spiro junction is 89.1 (1)°. In the crystal, mol­ecules are linked through weak C—H⋯O and van der Waals inter­actions.

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For background to bioactive tetronic acid derivatives, see: Fischer et al. (1993 ▶); Bayer Aktiengesellschaft (1995) ▶.