Phytochemical analysis demonstrates isolation of a novel nor-megastigmane from Rhaphiostylis beninensis leaves, indicating acetylcholinesterase inhibitory activity.
A novel nor-megastigmane, normegastigmane-5α,9-epoxy-3β,8-diol (1), together with 10 known compounds of diverse classes including megastigmanes, sesquiterpenoids, and triterpenoids were isolated from the leaves of Rhaphiostylis beninensis. The structure of 1 was established by 1D and 2D NMR and HRESIMS data analysis. The known compounds were identified as 5,11-epoxy-3,9-megastigmanediol (2), 7-megastigmene-3,6,9-triol (3), 1,3-dihydroxypropan-2-yl stearate (4), (1E,5E)-1,5-dimethyl-8-(propan-2-ylidene)cyclodeca-1,5-diene germacrene (5) 3,5-dihyroxy-6,7-megastigmadien-9-one (6), squalene (7), β-amyrin (8), β-amyrone (9), β-amyrin eicosanoate (10), and β-sitosterol (11). Compounds 2, 3, and 6 displayed inhibitory effects on acetylcholinesterase enzyme. This is the first report of these compounds from the plant and their anticholinesterase activity.
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Adegun et al. (2024) studied this question.
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