Voagafries A-E, undescribed indole alkaloids with anti-glioma activity from Voacanga africana.

Phytochemistry

School of Pharmaceutical Science & Yunnan Provincial Key Laboratory of Pharmacology for Natural Products, Kunming Medical University, Kunming, 650500, China; Yunnan College of Modern Biomedical Industry, Kunming Medical University, Kunming, 650500, China. Electronic address:

Published: December 2024

Voagafries A-E, five undescribed monoterpenoid indole alkaloids (MIAs), were isolated from the stem bark of Voacanga africana. Voagafrie A (1) has a unique 6/5/5/6/6 spiral ring skeleton with an indolone-fused 9-oxo-3-aza-tricyclo[6,3,1,0]-12-alkane-10-carbonyllactone. Voagafrie B (2) is a rare 5,6-seco diazine scaffold, whereas voagafrie C (3) possesses an octahydropyrrolo[2,3-b] pyrrole-fused 2,8-diazabicyclo[3.3.1] nonane. In addition, voagafrie D (4) represents an additional 3C ibogamine-type MIA. Their structures were elucidated using extensive spectroscopic and computational analyses and a plausible biosynthetic pathway originating from conopharyngine was proposed. Furthermore, voagafries B (2) and E (5) exhibited significant cytotoxicity against SH-SY5Y at 10 μmol/L with cell viabilities of 72.7 ± 3.8 and 79.5 ± 2.1, respectively, which were comparable to that of the positive drug paclitaxel (64.1 ± 0.9). Based on the research on several cell death-related factors, these compounds may be involved in apoptosis; therefore, it is necessary to advance our understanding of them through future studies.

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http://dx.doi.org/10.1016/j.phytochem.2024.114361DOI Listing

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Voagafries A-E, undescribed indole alkaloids with anti-glioma activity from Voacanga africana.

Phytochemistry

December 2024

School of Pharmaceutical Science & Yunnan Provincial Key Laboratory of Pharmacology for Natural Products, Kunming Medical University, Kunming, 650500, China; Yunnan College of Modern Biomedical Industry, Kunming Medical University, Kunming, 650500, China. Electronic address:

Voagafries A-E, five undescribed monoterpenoid indole alkaloids (MIAs), were isolated from the stem bark of Voacanga africana. Voagafrie A (1) has a unique 6/5/5/6/6 spiral ring skeleton with an indolone-fused 9-oxo-3-aza-tricyclo[6,3,1,0]-12-alkane-10-carbonyllactone. Voagafrie B (2) is a rare 5,6-seco diazine scaffold, whereas voagafrie C (3) possesses an octahydropyrrolo[2,3-b] pyrrole-fused 2,8-diazabicyclo[3.

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