HETEROCYCLES

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■ Three New Phlegmarine-Type Lycopodium Alkaloids, Lycoposerramines-X, -Y and -Z, Having a Nitrone Residue, from Lycopodium serratum

Kazuaki Katakawa, Mariko Kitajima, Kentaro Yamaguchi, and Hiromitsu Takayama*

*Graduate School of Pharmaceutical Sciences, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan

Abstract

Three new phlegmarine-type Lycopodium alkaloids, lycoposerramines-X (2), -Y (3), and -Z (5), having a nitrone residue were isolated from the club moss Lycopodium serratum Thunb. The structures of these new alkaloids, together with the stereostructures of the related alkaloids, huperzines J (1) and K (4), were elucidated by spectroscopic analyses.