The title compounds 1, 2 and 3 became accessible from an appropriately functionalized podocarpenone 4 in short sequences of operations, in which the key step involves the toluene-p-sulfonic acid-induced rearrangement of 13-epimeric epoxides 6 and 7.
A. Abad, C. Agulló, M. Arnó, M. L. Marín and R. J. Zaragozá, J. Chem. Soc., Perkin Trans. 1, 1994, 2987 DOI: 10.1039/P19940002987
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