The synthesis of saturated bis-spiroacetal (11) from an intramolecular catalysed cyclization of a keto-epoxide together with the preparation of unsaturated bis-spiroacetal (16)via a Barton-type reaction of substituted hydroxy spiroacetal (15) highlight a means of constructing the above-named ring system.
R. Baker and M. A. Brimble, J. Chem. Soc., Chem. Commun., 1985, 78 DOI: 10.1039/C39850000078
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