New Phenalenone-type Phytoalexins from Musa acuminata (Colla AAA) Grand Nain

摘要: Abstract Four new phenalenone-type phytoalexins (2–5) have been isolated from rhizomes of Musa acuminata (AAA) infected with the fungus Fusarium oxysporum. The structures were elucidated using spectroscopic evidence, chemical correlation, synthesis, and X-ray diffraction analysis. major compound 2, has previously described as a natural product, named anigorufone, but never phytoalexia. shift for all hydrogen carbon atoms in substances unambiguously established by mono- bidimensional, homo- heteronuclear NMR experiments (1HNMR, 13CNMR, COSY, HMQC HMBC). In preliminary vitro assays, four shown inhibitory activity on growth germinative tube oxysporum f. sp. cubense race 4.