A mechanism is proposed for the formation of the 2,6-dioxabicyclo[3.2.1]octane moiety of the aurovertins, metabolites of Calcarisporium arbuscula, based on the observed 18O isotope shifts in the proton-decoupled 13C n.m.r. spectra of aurovertin B and D derived from [1-13C, 18O2]acetate and 18O2 gas.
P. S. Steyn and R. Vleggaar, J. Chem. Soc., Chem. Commun., 1985, 1796 DOI: 10.1039/C39850001796
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