Robertson, JeremyChovatia, Praful T.Fowler, Thomas G.Withey, Jonathan M.Woollaston, Daniel J.2016-01-122022-05-272022-05-272010Robertson, J., Chovatia, P., Fowler, T., Withey, J., & Woollaston, D. (2010). Oxidative spirocyclisation routes towards the sawaranospirolides. Synthesis of ent-sawaranospirolides C and D. Organic & Biomolecular Chemistry, 8(1), 226-233. doi:10.1039/B918091Ehttps://hdl.handle.net/20.500.14078/281Two routes are described for the synthesis of the sawaranospirolides, stereoisomeric spirolactone ascorbigenins isolated from Chamaecyparis pisifera. Trapping of the keto enal formed by oxidation of a functionalised 2-(4-hydroxybutyl)furan affords a potential butenolide spiroacetal precursor to sawaranospirolides A and C. Alternatively, epoxidation of protected 3-(dihydropyran-2-yl)-3-arylpropanoic acids results in spirolactonisation to generate ent-sawaranospirolide C; a related acid-mediated spirocyclisation gave access to ent-sawaranospirolide D.enAll Rights Reservedorganic chemistryenol ethersspiroacetalArticlehttps://doi.org/10.1039/B918091E