立体化学
化学
壬烷
十五烷
立体中心
圆二色性
有机化学
对映选择合成
催化作用
作者
Mengting Liu,Wenping Sun,Ling Shen,Yan He,Junjun Liu,Jianping Wang,Zhengxi Hu,Yonghui Zhang
标识
DOI:10.1002/anie.201905966
摘要
Abstract Bipolarolides A–G ( 1 – 7 ), seven novel ophiobolin‐derived sesterterpenes with three new types of skeletons, were characterized from fungus Bipolaris sp. TJ403‐B1. Their structures were determined via spectroscopic analyses, X‐ray crystallography, and quantum chemical 13 C NMR and electronic circular dichroism (ECD) calculations. Compounds 1 and 2 were uniquely defined by a multicyclic caged oxapentacyclo[9.3.0.0 1,6 .0 5,9 .1 8,12 ]pentadecane‐bridged system. Compounds 3 and 4 featured an unprecedented 5‐5‐5‐5‐fused core skeleton, while 3 also contained an unexpected C‐3–C‐14 oxygen bridge to construct the caged architecture. Compounds 5 – 7 form a new class of highly modified pentacyclic oxaspiro[4.4]nonane‐containing sesterterpene‐alkaloid hybrids. Their biosynthetic pathways and potential HMG‐CoA reductase inhibitory and antimicrobial activities are also discussed.
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