Abstract
The structures of two new macrocyclic jatrophane diterpenoid esters from the whole
herb of Euphorbia esula, were established as 11,14-epoxy-3β,5α,7β,8α,9α,15β-hexaacetoxy-12-oxo-13αH-jatropha-6(17)-ene (1) and 1α,3β-diacetoxy-5α,7β-dibenzoyloxy-9,14-dioxo-11β,12α-epoxy-2α,8α,15β-trihydroxy-13βH-jatropha-6(17)-ene (2) by a combination of 1D- and 2D-NMR techniques as well as UV, IR and mass spectral
data. Bioassay evaluation of all isolates against the human tumor cell lines (B16,
KB, SMMC and BGC) indicated that ester 2 was cytotoxic to B16 with the IC50 value being 1.81 μg/ml. In addition, the irritant activity assay indicated that both
diterpenoids were inactive (ID24
50 > 100 μg/ear).
Key words
Euphorbia esula L. - Euphorbiacae - jatrophane diterpenoid esters - irritation - cytotoxicity
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Prof. R. X. Tan
Institute of Functional Biomolecules
School of Life Sciences
Nanjing University
Nanjing 210093
People’s Republic of China
Email: rxtan@netra.nju.edu.cn
Phone: and Fax: +86-25-3593201