New Adjacent Bis-Tetrahydrofuran Annonaceous Acetogenins from Annona muricata

Abstract

Bioactivity-guided fractionation led to the isolation of two new Annonaceous acetogenins, annocatacin A (1) and annocatacin B (2), from the seeds and the leaves, respectively, of Annona muricata. Compounds 1 and 2 are the first examples where the adjacent bis-tetrahydrofuran ring system is located at C-15. The new structures were elucidated and characterized by spectral and chemical methods. Both Annonaceous acetogenins 1 and 2 showed significant in vitro cytotoxicity toward the human hepatoma cell lines, Hep G2 and 2,2,15, and were compared with the known adjacent bis-tetrahydrofuran acetogenins, neoannonin (3), desacetyluvaricin (4), bullatacin (5), asimicin (6), annoglaucin (7), squamocin (8), and rollimusin (9).

Key words

Annona muricata - Annonaceae - annocatacin A - annocatacin B - Annonaceous acetogenins - human hepatoma cell - cytotoxic

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