Alkaloids from leaves and root bark of Ervatamia hirta
1991
Clivio, P. | Richard, B. | Deverre, J.R. | Sevenet, T. | Zeches, M. | Le Men-Oliver, L.
During chemical investigation of the leaves and root bark of Ervatamia hirta, 33 alkaloids were isolated. Seven are new: six are the 'monomeric' alkaloids (E) 16-epi-normacusine B, (E) 16-epi-affinisine, O-acetyl-16-epi-affinisine, affinisine-N(4)-oxide, dehydro-16-epi-affinisine, norfluorocurarine-N(4)-oxide, and the seventh is the bisindole 16-decarbomethoxyvoacamine-pseudoindoxyl. The known alkaloids are: (E) 16-epi-isositsirikine, beta-yohimbine, yohimbine, 19,20-dehydro-beta-yohimbine, beta-yohimbine-pseudoindoxyl, isositsirikine, 19,20-dihydroisositsirikine, beta-yohimbine-oxindole, normacusine B, affinisine, vobasine, dregamine, tabernaemontanine, norfluorocurarine, 12-hydroxynorfluorocurarine, apparicine, 3,14-dihydroellipticine, antirhine, voacristine, ibogaine, iboxygaine, iboxygaine-hydroxyindolenine, iboluteine, 4',17,(17 beta)-dihydrotchibangensine, 16-decarbomethoxyvoacamine and 19,20-dihydro-16-decarbomethoxyvoacamine. Structural elucidation of the new alkaloids is based on spectral data and chemical correlations.
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