Macrocarpamine, a new bisindole alkaloid from Alstonia macrophylla WALL. A new bisindole alkaloid give the name (−)‐macrocarpamine (3) was isolated from the bark of Alstonia macrophylla WALL. Under pyrolytic conditions 3 is cleaved into the two known bases (+)‐pleiocarpamine (2) and (−)‐anhydro macrosalhin‐methin (5) (Scheme 1). The structure of 3 (including relative configuration) was deduced on the basis of chemical evidence and from its UV.‐, IR.‐, NMR.‐ and mass spectroscopic data.
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Mayerl et al. (1978) studied this question.
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