期刊
ORGANIC LETTERS
卷 16, 期 22, 页码 5944-5947出版社
AMER CHEMICAL SOC
DOI: 10.1021/ol502973c
关键词
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资金
- NCI [R01 CA90265]
- NIGMS [P41 GM09060]
- NSF [DEB-0640996, DEB-1045766]
- China Scholarship Council
Delitschiapyrone A (1), an alpha-pyronenaphthalenone adduct with an unprecedented pentacyclic ring system, was isolated from a solid culture of the leaf-associated fungus Delitschia sp. FL1581. The structure of 1 was elucidated by spectroscopic analysis and X-ray crystallography, and its absolute configuration was defined by experimental and calculated ECD. Biosynthetically, the unique 6/6/5/7/6 pentacyclic core of 1 may be formed by an intermolecular DielsAlder-type addition of the precursors derived from (1?R)-2',3'-dihydropyrenocine C (2) and 6-ethyl-2,7-dimethoxyjuglone (3) found to co-occur with 1 in this fungus.
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