Add time:07/16/2019 Source:sciencedirect.com
Five antiplasmodial BISABOLOLOXIDE (cas 11087-43-7) sesquiterpene diesters were isolated from an EtOAc extract of the aerial parts of Artemisia persica following an HPLC-time-based activity profiling of the extract. Structure elucidation was achieved by 1D and 2D NMR experiments. Relative configurations of cyclohexenone/cyclohexene and tetrahydropyran moieties of 1–5 were established on the basis of 3JH–H coupling constants and NOE difference spectra. Stereochemical correlation of the two rings, and assignment of absolute configuration of 1–5 were achieved by comparison of experimental ECD spectra with simulated ECD data for possible stereoisomers, by using time dependent density function theory (TDDFT). Bisaboloids 1–4 exhibited in vitro antimalarial activity against Plasmodium falciparum, with IC50 values ranging from 2.8 to 20.1 μM, and selectivity indices (SI) in L-6 cells of 3.7–11.9.
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