Monoterpenoid Indole Alkaloids from the Bark of Alstonia scholaris

Abstract

Six new monoterpenoid indole alkaloids, scholarisines B−G (1–6), together with 15 known analogues (7–21), were isolated from the bark of Alstonia scholaris. Their structures were determined by 1D and 2D NMR spectra and MS analyses. The structure of 1 was further supported by the single-crystal X-ray.

Key words

Alstonia scholaris - Apocynaceae - monoterpenoid indole alkaloids - scholarisines B–G

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