From the medicinal plants
Gelsemium, various skeletal type of indole alkaloids were isolated. Along the biogenetic speculation of these alkaloids, some of the structurally complex compounds, involving sarpagine-, humantenine-, koumine-, and gelsedine-type, were prepared from ajmaline and the
Gardneria alkaloids. In the second half of this article, recent synthetic studies on the sarpagine type alkaloids and on a principal
Gelsemium alkaloid, gelsemine, are reviewed.
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