Abstract
Six new humantenine-type ( 1– 6) and two new gelsemine-type ( 7, 8) oxindole alkaloids and one new indole alkaloid ( 9) were isolated from the leaves and branches of Gelsemium rankinii. The structures of the new alkaloids were determined by spectroscopic analyses. Among them, 6-hydroxyhumantenine ( 5) is the first example of a Gelsemium alkaloid with an oxygen function at C-6 position, and is a plausible biogenetic precursor of gelsemine-type alkaloids.
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