Acta Cryst. (2012). E68, o3392-o3393
[ doi:10.1107/S1600536812046776 ]
Abstract: The title compound, C17H24O5, featuring a 2-carbethoxy-3-oxepanone unit in its intramolecularly O-HO hydrogen-bonded enol form, was obtained via [(CF3CO2)2Rh]2-catalysed intramolecular O-H bond insertion in the -diazo--hydroxy--ketoester, ethyl 4-[(1S,3aS,6R,6aS)-6-hydroxy-2,2,3a-trimethyl-3-oxo-octahydropentalen-1-yl]-2-diazo-3-oxobutanoate. The seven-membered oxacyclic ring, thus constructed on a cis-fused diquinane platform, was found to adopt a distorted boat-sofa conformation.
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