Three novel non-nitrogenous cassane diterpenoids from Erythrophleum suaveolens (Guill. et Perr.) Brenan (Fabaceae)

Abstract

During our research to contribute to the elucidation of the chemical composition of the root bark of E. suaveolens, six non-nitrogenous cassane diterpenoids (1–6) were isolated and identified. Of these secondary metabolites, three have never been previously described: Cassan-13,15-dien-3-oxo-17-oic acid (2), Cassan-15-en-[7,17]-γ-lactone (3) and 6α-hydroxy-cassamic acid (5). The other are known but, never isolated from the root barks of E. suaveolens (Fabaceae): Cassan-13,15-dien-17-oic acid (1), 6α-hydroxy-cassamic acid methyl esther (4) and cassamic acid (6). Their structures were established according to the spectroscopic data (NMR 1D and 2D, HR-ESI-MS and IR), in comparison with those of literature. The originality of this study lies in the fact that three new natural molecules were isolated and identified. In addition, all the isolated compounds (1–6) were reported for the first time from the root barks of E. suaveolens.

Graphical Abstract

Keywords:

• Erythrophleum suaveolens
• Fabaceae
• isolation
• cassane diterpenoids

Disclosure statement

The authors declare no competing financial interest.

Additional information

Funding

This work was financially supported by ASCAD (Académie des Sciences, des Arts, des Cultures d'Afrique et des Diasporas africaines) and PASRES (Le Programme d'Appui Stratégique à la Recherche Scientifique).