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Complete NMR spectral assignments of two lactucin-type sesquiterpene lactone glycosides from Picris conyzoides
Authors:Michalska Klaudia  Szneler Edward  Kisiel Wanda
Affiliation:Department of Phytochemistry, Institute of Pharmacology, Polish Academy of Sciences, Pl-31-343 Krakow, Poland.
Abstract:Complete (1)H and (13)C NMR signal assignments of two lactucin-type sesquiterpene lactone glycosides, derivatives of 11β,13-dihydrolactucin, isolated from roots of Picris conyzoides, were achieved by one- and two-dimensional NMR experiments, allowing the correction of previously published data for cichorioside B and the structure elucidation of its new ester with 3-hydroxy-2-methylpropanoic acid. In addition, seven known sesquiterpene lactones and three phenolic compounds were isolated from the plant material.
Keywords:1H NMR  13C NMR  two‐dimensional NMR  Picris conyzoides  Asteraceae  sesquiterpene lactones  glycosides
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