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Alstoscholarisine F (1), a monoterpenoid indole alkaloid pigment with unprecedented carbon skeleton, and alstoscholarisine G (2) incorporated with a third nitrogen atom were isolated from the long-term stored leaves of Alstonia scholaris. Their structures were established by extensive MS and NMR spectroscopic analysis and the absolute configuration of 1 was defined by comparison of experimental and...
Eleven new indole alkaloids, alstoniascholarines A–K (1–11), along with one known analogue, were isolated from the aqueous fraction of Alstonia scholaris leaf extract. Their structures were established on the basis of extensive spectroscopic data analysis, chemical transformation, and quantum theory. Alkaloid 4 possessed a novel skeleton with fused-ring and a six-membered ring, the absolute configuration...
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