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The new 2,3-secoiridoids morisecoiridoic acids A ( 1 ) and B ( 2 ), the new iridoid 8-acetoxyepishanzilactone ( 3 ), and four additional known iridoids ( 4 - 7 ) were isolated from the leaf and stem bark methanol extracts of Morinda asteroscepa using chromatographic methods. The structure of shanzilactone ( 4 ) was revised. The purified metabolites were identified using NMR spectroscopic and mass spectrometric techniques, with the absolute configuration of 1 having been established by single-crystal X-ray diffraction analysis. The crude leaf extract (10 μg/mL) and compounds 1 - 3 and 5 (10 μM) showed mild antiplasmodial activities against the chloroquine-sensitive malaria parasite Plasmodium falciparum (3D7).

Secoiridoids and Iridoids from Morinda asteroscepa