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2006:
Macías Francisco A; Galindo José L G; Varela Rosa M; Torres Ascensión; Molinillo José M G; Fronczek Frank R
Heliespirones B and C: two new plant heliespiranes with a novel spiro heterocyclic sesquiterpene skeleton.
Organic letters 2006;
8(
20):.
From the medium, polar bioactive fractions of leaf aqueous extract of Helianthus annuus L., heliespirones B (2) and C (3) have been isolated. The structural elucidation was based on extensive spectral studies. A probable biogenesis of heliespirone skeleton is proposed and discussed. The structure of heliespirone B has been confirmed by X-ray diffraction analysis.
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