New Humantenine-Type Alkaloids from Gelsemium elegans

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Abstract
The alkaloid extract of the whole plant of Gelsemium elegans has afforded four new alkaloids: N-desmethoxyrankinidine [1], 11-hydroxyrankinidine [3], 11-hydroxyhumantenine [5], and 11-methoxyhumantenine [7], as well as the known alkaloids rankinidine [2], humantenine [4] and humantenirine [6]. The structure of 5 was established through X-ray crystallographic analysis, and the structures of the other three new alkaloids were deduced by spectral analysis (1H, 13C, APT, 2D-COSY and 2D-HETCOR).

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