A–E, Unexpected Chromone–Monoterpene-Derived
Meroterpenoids from Centrapalus pauciflorus
Posted on 2023-03-18 - 13:06
Five unusual meroterpenoids based on new carbon skeletons, pauciflorins A–E (1–5), were isolated by multistep chromatographic separations of a methanol extract of the aerial parts of Centrapalus pauciflorus. Compounds 1–3 are derived by the connection of a 2-nor-chromone and a monoterpene unit, whereas 4 and 5 are dihydrochromone–monoterpene adducts with a rarely occurring orthoester functionality. The structures were solved using 1D and 2D NMR, HRESIMS, and single-crystal X-ray diffraction. Pauciflorins A–E were evaluated for antiproliferative activity against human gynecological cancer cell lines, but were inactive (IC50 < 10 μM) in each case.
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Krstić, Gordana; Saidu, Muhammad Bello; Bombicz, Petra; De, Sourav; Ali, Hazhmat; Zupkó, István; et al. (2023): Pauciflorins A–E, Unexpected Chromone–Monoterpene-Derived Meroterpenoids from Centrapalus pauciflorus. ACS Publications. Collection. https://doi.org/10.1021/acs.jnatprod.2c01132
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Muhammad Bello Saidu
Umar Shehu Gallah