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Lithocarpins A–D (1–4), the first examples of highly oxygenated tenellone-macrolide conjugated dimers, were isolated from the deep-sea derived fungus Phomopsis lithocarpus FS508. Their structures were elucidated by extensive spectroscopic analyses… Click to show full abstract
Lithocarpins A–D (1–4), the first examples of highly oxygenated tenellone-macrolide conjugated dimers, were isolated from the deep-sea derived fungus Phomopsis lithocarpus FS508. Their structures were elucidated by extensive spectroscopic analyses and X-ray diffraction techniques. Their plausible biogenetic pathways suggested a very intriguing and unusual [4 + 2] cycloaddition with an isobenzofuran as an electron-donating diene. Lithocarpins C and D exhibited a moderate inhibitory effect against three tumor cell lines with IC50 values ranging from 17.0 to 21.6 μM.
Journal Title: Organic chemistry frontiers
Year Published: 2018
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