The synthesis of (±)-3α-acetoxy-7,16-secotrinervita-7,11-dien-15β-ol 2, a defence substance of the termite Nastitermes princeps, is fully described. The key step is an intramolecular Dieckmann condensation of substrates 4 and 17, in which an unusually low acidity of the methine proton alpha to the ester carbonyl is observed.
T. Hirukawa, T. Shudo and T. Kato, J. Chem. Soc., Perkin Trans. 1, 1993, 217 DOI: 10.1039/P19930000217
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