RESUMEN
A new megastimane sesquiterpenoid, cassianol A (1), and five known analogues (2-6) were isolated from the leaves extract of Cinnamomum cassia. Their structures were elucidated by extensive spectroscopic methods and single-crystal X-ray diffraction analyses. All the isolates were isolated from C. cassia for the first time. The anti-inflammatory activities of compounds 1-6 were evaluated against nitric oxide (NO) production in LPS-induced RAW 264.7 mouse macrophages.
Asunto(s)
Cinnamomum aromaticum , Sesquiterpenos , Animales , Antiinflamatorios/química , Antiinflamatorios/farmacología , Cinnamomum aromaticum/química , Lipopolisacáridos/farmacología , Ratones , Estructura Molecular , Óxido Nítrico , Extractos Vegetales/química , Sesquiterpenos/farmacologíaRESUMEN
Bipolarins A-H (1-8), eight new tetracyclic ophiobolin-type sesterterpenes featuring a rare oxaspiro[4.4]nonane moiety, were isolated from cultures of fungus Bipolaris sp. TJ403-B1. Their structures and absolute configurations were elucidated by comprehensive spectroscopic analyses, single-crystal X-ray diffraction experiments, electronic circular dichroism and 13C NMR calculations. Additionally, compound 5 exhibited significant selective antimicrobial activity against Enterococcus faecalis with an MIC value 8 µg·mL-1.
Asunto(s)
Antiinfecciosos/química , Ascomicetos/efectos de los fármacos , Sesterterpenos/química , Antiinfecciosos/aislamiento & purificación , China , Cristalografía por Rayos X , Espectroscopía de Resonancia Magnética , Estructura Molecular , Sesterterpenos/aislamiento & purificación , Triticum/microbiologíaRESUMEN
A phytochemical investigation of an ethyl acetate extract of the aerial parts of Isodon pharicus led to the isolation of 21 new 7α,20-epoxy-ent-kaurane diterpenoids, pharicins C-W (1-21), and 29 known (22-50) analogues. The structural characterization of 1-21 and assignment of their relative configurations were accomplished by spectroscopic data interpretation, while the structures of 1 and 16 were confirmed by X-ray crystallography. The absolute stereostructure of 1 was confirmed by electronic circular dichroism data analysis. Twenty-five of the diterpenoids were screened for their cytotoxic activities against a panel of tumor cell lines, including HL-60, SMMC-7721, A-549, MCF-7, and SW-480. Compounds 11, 16, 38, and 48 exhibited inhibitory activities against these tumor cell lines with IC50 values ranging from 1.01 to 9.62 µM, while 2, 15, 29, and 47 exhibited moderate cytotoxic potency.
Asunto(s)
Diterpenos de Tipo Kaurano/química , Isodon/química , Antineoplásicos Fitogénicos/química , Antineoplásicos Fitogénicos/farmacología , Línea Celular Tumoral , Cristalografía por Rayos X/métodos , Diterpenos de Tipo Kaurano/farmacología , Ensayos de Selección de Medicamentos Antitumorales , Medicamentos Herbarios Chinos/química , Medicamentos Herbarios Chinos/farmacología , Células HL-60 , Humanos , Células MCF-7 , Componentes Aéreos de las Plantas/químicaRESUMEN
Fourteen new rearranged 6/6/5/6-fused triterpenoid acids, namely, kadcoccine acids A-N (1-14), were isolated from an EtOAc-soluble extract of the stems of Kadsura coccinea. Their structures were characterized mainly by analyzing 1D and 2D NMR and HRESIMS data and were shown to feature a rare 14(13â12)-abeo-lanostane skeleton. Compounds 7 and 8 represented the first examples of a 5-substituted 2(5H)-furanone motif on the C-17 side chain of this skeleton. The absolute configurations of C-23 for compounds 1, 7, and 8 were determined by comparison of their experimental electronic circular dichroism spectra. All the isolates were screened for their in vitro cytotoxicity against six human tumor cell lines (HL-60, SMMC-7721, A-549, MCF-7, SW-480, and HeLa), and compounds 2 and 8 exhibited weak inhibitory effects with IC50 values ranging from 3.11 to 7.77 µM.
Asunto(s)
Antineoplásicos Fitogénicos/química , Antineoplásicos Fitogénicos/aislamiento & purificación , Medicamentos Herbarios Chinos/química , Medicamentos Herbarios Chinos/aislamiento & purificación , Kadsura/química , Tallos de la Planta/química , Triterpenos/química , Triterpenos/aislamiento & purificación , Antineoplásicos Fitogénicos/farmacología , Supervivencia Celular/efectos de los fármacos , Ensayos de Selección de Medicamentos Antitumorales , Medicamentos Herbarios Chinos/farmacología , Femenino , Células HL-60 , Células HeLa , Humanos , Lanosterol/química , Células MCF-7 , Estructura Molecular , Resonancia Magnética Nuclear Biomolecular , Relación Estructura-Actividad , Triterpenos/farmacologíaRESUMEN
Eleven triterpene acids including 10 new compounds (kadcoccinic acids A-J, 1-10) were isolated from the stems of Kadsura coccinea. Except for 10, these compounds feature a rearranged lanostane skeleton with a 6/6/5/6 tetracyclic ring system, and compounds 1 and 2 are the first examples of 2,3-seco-6/6/5/6-fused tetracyclic triterpenoids. Their structures were established primarily by spectroscopic and spectrometric methods. Additionally, the absolute configuration of 3 was determined by single-crystal X-ray diffraction. Several of the compounds isolated were tested for their anti-HIV-1 and cytotoxic activities.