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Phlegmadine A: A Lycopodium Alkaloid with a Unique Cyclobutane Ring from Phlegmariurus phlegmaria
Zhi-Jun Zhang1, Chen Wang2, Xing-De Wu1
1State Key Laboratory of Phytochemistry and Plant Resources in West China , Kunming Institute of Botany, Chinese Academy of Sciences , Kunming 650201 , People's Republic of China.
Abstract:
Phlegmadine A (1), a Lycopodium alkaloid with a unique cyclobutane ring and featuring a complex tetracyclo[4.2.2.03,8.03,10]decane-bridged system, together with three biogenetically related known compounds, was isolated from the Phlegmariurus phlegmaria. The structures and absolute configurations of 1 and 2 were determined by NMR and single-crystal X-ray analysis. Among them, compound 2 exhibited noticeable protective effects for long-term potentiation impairment by corticosterone induced in mice. Moreover, we succeeded in the efficient synthesis of 1 from 3 by a biomimetic synthesis method.
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