RESUMO
Phytochemical investigations of the n-butanol soluble sub-fraction of the methanolic extract of Galinsoga parviflora Cav. has led to the isolation of two new glucosides named as parvisides A (1) and B (2). Their structures have been assigned on the basis of their spectral analysis including 1D and 2D NMR techniques.
Assuntos
Asteraceae/química , Glucosídeos/química , Extratos Vegetais/química , Glucosídeos/isolamento & purificação , Espectroscopia de Ressonância Magnética , Estrutura Molecular , Extratos Vegetais/isolamento & purificaçãoRESUMO
Phytochemical investigation of the ethyl acetate soluble fraction of the methanol soluble extract of the roots of Daphne oleoides resulted in isolation and identification of two new isomeric biisoflavonoids characterized as 8,8"-bi-6-hydroxyorobol (1) and 8,8"-bi-6, 2'-dihydroxygenistein (2). The structures of these compounds were established by analysis of their 1D and 2D NMR and HRMS data.
Assuntos
Daphne/química , Flavonoides/química , Isoflavonas/química , Raízes de Plantas/química , Cromatografia Líquida de Alta Pressão , Indicadores e Reagentes , Espectroscopia de Ressonância Magnética , Espectrometria de Massas , Extratos Vegetais/química , Espectrometria de Massas de Bombardeamento Rápido de Átomos , Espectrofotometria Infravermelho , Espectrofotometria UltravioletaRESUMO
A new pregnane derivative, 2,6beta,7beta-trihydroxy-4-methyl-19-norpregna-1,3,5(10)-trien-17-one, has been isolated from the ethyl acetate soluble fraction of Potentilla evestita along with a pregnane derivative, 11alpha,17alpha,21-trihydroxypregna-4,16(22)-diene-3,20-dione, that is reported for the first time as a natural product. Their structures were elucidated with the aid of 1H and 13C NMR spectra and by COSY, HMQC, HMBC and NOESY experiments.
Assuntos
Potentilla/química , Pregnanos/química , Estrutura MolecularRESUMO
Confertins A (1) and B (2), new 3-C-carboxylated flavones, have been isolated from the ethyl acetate soluble fraction of the rhizomes of Caragana conferta. Their structures have been assigned on the basis of spectroscopic studies.
Assuntos
Caragana/química , Flavonas/isolamento & purificação , Rizoma/química , Flavonas/química , Espectroscopia de Ressonância MagnéticaRESUMO
Mutiniside (1), new phenolic glucoside, and the flavonoidal glucoside cephacoside (2) have been isolated from the n-BuOH soluble fraction, along with lupeol (3), beta-sitosterol (4), stigmasterol (5), methyl-4-hydroxybenzoate (6), taraxacin (7), ursolic acid (8), and beta-sitosterol-3-O-beta-D-glucopyranoside (9), have been isolated from the EtOAc soluble fraction of Abutilon muticum. Compounds 2-9 are reported for the first time from this species. Compound 1 showed significant antioxidant activity while moderate inhibitory activity was observed against the enzyme lipoxygenase.