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Hydronaphthalenones and a dihydroramulosin from the endophytic fungus PSU-N24.

Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Prince of Songkla University, Songkla, Thailand.
CHEMICAL & PHARMACEUTICAL BULLETIN (Impact Factor: 1.56). 01/2009; 56(12):1687-90. DOI: 10.1248/cpb.56.1687
Source: PubMed

ABSTRACT Three new hydronaphthalenone derivatives (1-3) and one new dihydroramulosin derivative (4), were isolated from the endophytic fungus PSU-N24 together with eight known compounds. Their structures were elucidated by spectroscopic methods. Griseofulvin (9) displayed strong antifungal activity against Microsporum gypseum SH-MU-4 with a minimum inhibitory concentration (MIC) value of 2 microg/ml while all metabolites exhibited very weak antibacterial activity (MIC value>or=128 microg/ml) against Staphylococcus aureus, both standard and methicillin-resistant strains. 3-(2-Hydroxypropyl)benzene-1,2-diol (10) showed moderate antimalarial activity against Plasmodiun falciparum with an IC(50) value of 6.68 microg/ml. For antimycobacterial activity against Mycobacterium tuberculosis, compound 3 gave the best activity with the MIC value of 12.50 microg/ml.

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