Journal
JOURNAL OF NATURAL PRODUCTS
Volume 81, Issue 6, Pages 1357-1367Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jnatprod.7b00898
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Funding
- Ege University Scientific Research Project [15ECZ9011]
- TUBITAK [114Z958]
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Biotransformation of neoruscogenin (NR, 1, spirosta-5,25(27)-diene-1 beta,3 beta-diol), the major bioactive sapogenin of Ruscus preparations, was carried out with the endophytic fungus Alternaria eureka. Fourteen new biotransformation products (2-15) were isolated, and their structures were elucidated by NMR and HRESIMS data analyses. A. eureka affected mainly oxygenation, oxidation, and epoxidation reactions on the B and C rings of the sapogenin to afford compounds 8-15. In addition to these, cleavage of the spiroketal system as in compounds 2-7 and subsequent transformations provided unusual metabolites. This is the first study reporting conversion of the spirostanol skeleton to cholestane-type metabolites 2-5. Additionally, the cleavage of the C-22/C-26 oxygen bridge yielding a furostanol-type steroidal framework and subsequent formation of the epoxy bridge between C-18 and C-22 in 7 was encountered for the first time in steroid chemistry.
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