13C-NMR. Spectroscopy of Naturally Occurring Substances. XLV. Iboga Alkaloids

Abstract

The carbon shifts of the Iboga-type alkaloids catharanthine, voacangine, coronaridine, ibogaine, dihydrocatharanthine and epiibogamine were recorded and correlated with the conformation of the natural bases. A 13C-NMR. analysis of heyneanine determined its C(19) configuration and a similar study of epiheyneanine proved its structure.

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