Xanthane sesquiterpenoids from the roots and flowers of Xanthium cavanillesii
Abstract The sesquiterpene lactones xanthanodiene, 4 epi xanthanol, 4 epi isoxanthanol, and 4 epi xanthinin, as well as the xanthanolide derivative 4 oxo bedfordia acid were isolated from the chloroform extracts of roots and flowers of Xanthium cavanillesii Schouw. The identities of these compounds were corroborated through comparison of their spectroscopic data, including IR, MS, and 1H and 13C NMR assignments, with literature reports. In addition, the structural characterization of 4 oxo bedfordia acid was revisited and a comprehensive spectroscopic study of the compound is presented. This is to our knowledge the first phytochemical investigation of the roots of X. cavanillesii, and of flowers in the whole Xanthium genus.
Natural product research