Hunteria umbellata

These two bases, pleiomutine from Pleiocarpa mutica Benth. and umbellamine from Hunteria umbellata (K. Schum.) Hall. F. Carpodinus umbellatus K. Schum., Polyodoa umbellata Stapf., Picralima umbellata Stapf.), possess a common building block, namely 14,15-dihydroeburnamenine (229). This is bonded through C(14) to the aromatic ring of the second monomeric component, an indoline. Umbellamine is probably identical with the alkaloid hunterine, of unknown constitution, from Hunteria eburnea Pichon. ... 

In structure (235) the stereochemistry of the pseudoakuammigine part is relative, although it probably corresponds to the absolute configuration, since the alkaloid corymine (242) of known absolute configuration occurs in the leaves and seeds of Hunteria umbellata. It has not yet been encountered in the root bark of the plant which contains umbellamine and other bisindole alkaloids. 

Hunteria umbellata (K. Schum.) Hall. f. Carpodinus umbeUatus K. Schum., Polyadoa umbellata Stapf, Picralima umbellata Stapf)... 

From the seeds of Hunteria umbellata (K. Schum.) Hall. f. Garpo-dinus umbdlatus K. Schum. Polyadoa umbellata Stapf Picralima umbellata Stapf) there has been reported the isolation of corymine XXX [first discovered in Hunteria corymbosa Roxb. (35)], 0-acetyl corymine, and a new base isocorymine, C22H26X2O4 (mp 183°-115° [ajj, —243° 0-acetate, mp 166°) for which the structure XXXI was suggested (36). 

Hunteria umbellata (seeds, su ested to be an artifact of isolation) ... 

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