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Bisleuconothines B-D, Modified Eburnane-Aspidosperma Bisindole Alkaloids from Leuconotis griffithii
Alfarius Eko Nugroho1, Wenjia Zhang1, Yusuke Hirasawa1
1Hoshi University Faculty of Pharmaceutical Sciences , Hoshi University , Shinagawa, Tokyo 142-8501 , Japan.
Abstract:
Three new bisindole alkaloids, bisleuconothines B-D (1-3), were isolated from the bark of Leuconotis griffithii. Their structures were elucidated by 1D and 2D NMR spectroscopy and DFT calculations. Bisleuconothine B (1) is the first monoterpene indole alkaloid dimer featuring bridges between both C-16-C-10' and C-2-O-C-9'. All compounds were deemed noncytotoxic (IC50 > 10 μM) when tested against A549 human lung adenocarcinoma cells.
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