The synthesis of the tricyclic carboxylic acid (3), from (±)-methyl isocopalate (4)via the key intermediate (5a), which confirms the proposed structure of (3), is described.
M. Gonzalez-Sierra, T. Kaufman and E. A. Ruveda, J. Chem. Soc., Chem. Commun., 1986, 418 DOI: 10.1039/C39860000418
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