(IUCr) Crystallography Journals Online

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Acta Cryst. (2002). E58, o1392-o1394 [ doi:10.1107/S160053680202086X ]

A novel diterpene lactone

A. C. Doriguetto, H. S. Vieira, J. A. Ellena, J. A. Takahashi, M. A. D. Boaventura and Y. P. Mascarenhas

Abstract: A highly rearranged novel dilactone, ent-5 [alpha] ,15 [alpha] -epoxy-9,10-friedo-10 [beta] ,11 [beta] -dihydroxy-16,11 [alpha] :19,10 [beta] -diseco-17-norkauran-16,19-dioic acid 16 $\rightarrow$ 11:19 $\rightarrow$ 10-dilactone, C₁₉H₂₄O₅, was synthesized from ent-kaur-9(11)-en,16-nor,19-oic acid, which was obtained by oxidation of grandiflorenic acid, under Baeyer-Villiger rearrangement conditions. The structure of the final product was determined unambiguously by X-ray analysis.

Online 22 November 2002