RESUMO
Four new stilbenoids, named cyrtopodinone (1), cyrtopodinol (2), and coeludols A and B (3-4) were isolated from the roots of Cyrtopodium paniculatum, together with 21 known stilbenoids derivatives (5-25). Their structures were elucidated by comprehensive spectroscopic analysis including extensive 1D and 2D-NMR techniques. The cytotoxic activities of the isolated compounds were tested on human glioblastoma U-87MG cell line with fluorescence-based image cytometry. Only four compounds (18, 19, 22 and 25) displayed moderate cytotoxicity with IC50 values of 45.2, 39.9, 58.2 and 48.0µM, respectively.
Assuntos
Orchidaceae/química , Raízes de Plantas/química , Estilbenos/química , Antineoplásicos Fitogênicos/química , Antineoplásicos Fitogênicos/isolamento & purificação , Antineoplásicos Fitogênicos/farmacologia , Linhagem Celular Tumoral , Humanos , Espectroscopia de Ressonância Magnética , Estrutura Molecular , Extratos Vegetais/química , Estilbenos/isolamento & purificação , Estilbenos/farmacologiaRESUMO
We report the first phytochemical study of the neotropical orchid Cyrtopodium paniculatum. Eight new compounds, including one phenanthrene 1, one 9,10-dihydro-phenanthrene 2, one hydroxybenzylphenanthrene 3, two biphenanthrenes 4-5, and three 9,10 dihydrophenanthrofurans 6-8, together with 28 known phenolic compounds, mostly stilbenoids, were isolated from the CH2Cl2 extract of its leaves and pseudobulbs. The structures of the new compounds were established on the basis of extensive spectroscopic methods.
