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  • Title: Cipacinerasins A-K, structurally diverse limonoids from Cipadessa baccifera.
    Author: Zhang DY, Lou HY, Chen C, Liu HF, Ni Zhang, Deng CY, Li JY, Pan WD.
    Journal: Phytochemistry; 2022 Aug; 200():113186. PubMed ID: 35500784.
    Abstract:
    Eleven undescribed limonoids, cipacinerasins A-K, involving of four diverse carbon skeletal types, along with fifteen known analogues, were isolated from the branches and leaves of Cipadessa baccifera. Within them, cipacinerasins A and B feature a rearranged tetrahydropyranyl ring B formed between C-8 and C-30, are unusual miscellaneous-type limonoids. Cipacinerasins E and F are rare trijugin-type limonoids, of which the D-ring δ-lactone is cleaved. Their structures were elucidated on the basis of extensive spectroscopic data (HRESIMS, NMR, UV and IR), electronic circular dichroism (ECD) calculations, and single-crystal X-ray diffraction analysis. All compounds were evaluated in vitro cytotoxicity against five human tumor cell lines (K562, HeLa, PC3, LN-Cap and Hell), and cipacinerasin E showed moderate antitumor activity with IC50 values ranging from 8.0 to 24.8 μM.
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