Wang CN, Lu HM, Gao CH, Guo L, Zhan ZY, Wang JJ, Liu YH, Xiang ST, Wang J, Luo XW. Cytotoxic benzopyranone and xanthone derivatives from a coral symbiotic fungus
Cladosporium halotolerans GXIMD 02502.
Nat Prod Res 2020;
35:5596-5603. [PMID:
32713199 DOI:
10.1080/14786419.2020.1799363]
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Abstract
Coral-derived microorganisms have been historically proven to be prolific sources of bioactive secondary metabolites. Twelve benzopyranone and/or xanthone derivatives, including a new benzopyranone with an uncommon carboxyl group at C-8, coniochaetone K (1), were obtained from the Beibu Gulf-derived coral symbiotic fungus Cladosporium halotolerans GXIMD 02502. Their structures were determined by extensive spectroscopic data interpretation and comparison with literature values. The absolute configuration of 1 was accomplished by comparison of specific optical rotation as well as quantum chemical ECD calculations. The in vitro cytotoxicity of compounds 1-12 against two human prostatic cancer cell lines, C4-2B and 22RV1, were evaluated. And compounds 1, 3, 6-8, and 10-11 demonstrated significant cytotoxicity with inhibitions ranging from 55.8% to 82.1% at the concentration of 10 μM.
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