New bioactive cyclopeptide alkaloids with rare terminal unit from the root bark of: Ziziphus cambodiana
© The Royal Society of Chemistry 2018. Six new 14-membered ring cyclopeptide alkaloids, cambodines A-F (1-6), and two known compounds, frangufoline (7) and lotusanine B (8), were isolated from the root bark extract of Ziziphus cambodiana Pierre. Their structures and configurations were established b...
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| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://repository.li.mahidol.ac.th/handle/123456789/45453 |
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| Institution: | Mahidol University |
| Summary: | © The Royal Society of Chemistry 2018. Six new 14-membered ring cyclopeptide alkaloids, cambodines A-F (1-6), and two known compounds, frangufoline (7) and lotusanine B (8), were isolated from the root bark extract of Ziziphus cambodiana Pierre. Their structures and configurations were established based on 1D and 2D NMR, HRMS, ECD, and X-ray crystallographic data. Compounds 1 and 3 are rare 5(14)-type cyclopeptide alkaloids that possess an imidazolidin-4-one ring in the terminal unit. The cyclopeptides were tested for their in vitro antiplasmodial, antitubercular, and cytotoxic effects against three cancer cell lines. Compound 3 showed significant antiplasmodial activity against the malarial parasite Plasmodium falciparum, with an IC50 value of 6.09 μM. |
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