Xanthanolides and xanthane epoxide derivatives from Xanthium strumarium.
From the aerial parts of Xanthium strumarium, three new xanthanolide and xanthane-type sesquiterpenoids, 11alpha,13-dihydroxanthatin, 4beta,5beta-epoxyxanthatin-1alpha,4alpha-endoperoxide, and 1beta,4beta,4alpha,5alpha-diepoxyxanth-11(13)-en-12-oic acid have been isolated, together with seven known compounds. The structures were determined by spectroscopic methods, particularly high resolution 1D, 2D NMR spectroscopy and NOE experiments.
Mahmoud
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Department of Chemistry, Faculty of Science, El-Minia University, El-Minia, Egypt. rumenia@enstinet.eg.net