期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 27, 期 45, 页码 11574-11579出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202101863
关键词
cationic cyclization; cobalt catalysis; diterpenes; glycosides; hydrovinylation; marine natural products
资金
- Fonds der Chemischen Industrie
- University of Cologne
Metabolites of the soft coral Pseudopterogorgia elisabethae, such as erogorgiaene and the pseudopterosines, are important target molecules for chemical synthesis due to their pronounced bioactivity. A short and efficient route towards these marine diterpenes has been developed, with notable C-C bond forming transformations. The anti-tubercular agent (+)-erogorgiaene and the pseudopterosin A aglycone were successfully synthesized, exhibiting promising biological activities.
Due to their pronounced bioactivity and limited availability from natural resources, metabolites of the soft coral Pseudopterogorgia elisabethae, such as erogorgiaene and the pseudopterosines, represent important target molecules for chemical synthesis. We have now developed a particularly short and efficient route towards these marine diterpenes exploiting an operationally convenient enantioselective cobalt-catalyzed hydrovinylation as the chirogenic step. Other noteworthy C-C bond forming transformations include diastereoselective Lewis acid-mediated cyclizations, a Suzuki coupling and a carbonyl ene reaction. Starting from 4-methyl-styrene the anti-tubercular agent (+)-erogorgiaene (>98 % ee) was prepared in only 7 steps with 46 % overall yield. In addition, the synthesis of the pseudopterosin A aglycone was achieved in 12 steps with 30 % overall yield and, surprisingly, was found to exhibit a similar anti-inflammatory activity (inhibition of LPS-induced NF-kappa B activation) as a natural mixture of pseudopterosins A-D or iso-pseudopterosin A, prepared by beta-D-xylosylation of the synthetic aglycone.
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