Trichodermaketones A−D and 7-O-Methylkoninginin D from the Marine Fungus Trichoderma koningii
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Abstract
Five new polyketide derivatives, 7-O-methylkoninginin D (1) and trichodermaketones A-D (2-5), together with four known compounds, koninginins A, D, E, and F, were isolated from the marine-derived fungus Trichoderma koningii. Trichodermaketones A (2) and B (3) are unprecedented polyketides with a bistetrafuran-containing tricyclic skeleton. The chemical structures and absolute configurations of compounds 1-5 were elucidated by comparing with literature data and extensive spectroscopic methods, including 2D NMR and CD spectroscopic analysis. Compounds 1-5 were evaluated for action against bacteria and fungi and for synergistic antifungal activity. Compound 2 showed synergistic antifungal activity against Candida albicans with 0.05 microg/mL ketoconazole.
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