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  • Title: Determination of absolute configuration of salvic acid, an ent-labdane from Eupatorium salvia, by vibrational circular dichroism.
    Author: Muñoz MA, Urzúa A, Echeverría J, Bucio MA, Hernández-Barragán A, Joseph-Nathan P.
    Journal: Phytochemistry; 2012 Aug; 80():109-14. PubMed ID: 22656857.
    Abstract:
    The relative stereochemistry at C13 and the absolute configuration of salvic acid, a constituent of the leaves of Eupatorium salvia, were established as the 13-(R)-ent-labdane 1. The results follow from vibrational circular dichroism measurements of the derived O-methyl ether methyl ester 3 which were compared to DFT B3LYP/DGDZVP calculated spectra. The relative stereochemistry of salvic acid at C13 was independently verified by single crystal X-ray diffraction measurements of 1, and of its derived diol 4.
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