RESUMO
A new glucuronolactone glycoside, phoenixoside B (1), has been isolated from the n-butanol soluble fraction of seeds of Phoenix dactylifera. The structure was characterized as 1-(1'-ethyl-beta-D-glucosyl)-4,5-diethyl-[alpha-D-glucofuranourono-6,3-lactone] on the basis of 1D and 2D-NMR spectroscopy and high-resolution mass spectrometry.
Assuntos
Arecaceae/química , Glucuronatos/isolamento & purificação , Glicosídeos/isolamento & purificação , Glucuronatos/química , Glicosídeos/química , Estrutura Molecular , Sementes/químicaRESUMO
A new megastigmane glycoside, phoenixoside A (1), has been isolated from the n-butanol--soluble fraction of seeds of Phoenix dactylifera. The structure was characterized as (6S,7Z,9R)-hydroxy-3-oxo-ionol-9-O-beta-D-glucopyranosyl-(1" --> 6')-beta-D-glucopyranoside on the basis of 1D and 2D NMR spectroscopy, high-resolution mass spectrometry, and CD spectroscopy.
Assuntos
Arecaceae/química , Glicosídeos/isolamento & purificação , Norisoprenoides/isolamento & purificação , Glicosídeos/química , Espectroscopia de Ressonância Magnética , Norisoprenoides/químicaRESUMO
Galinosoates A-C (1-3), new aromatic esters, have been isolated from the n-hexane soluble fraction of Galinsoga parviflora. Their structures were assigned from the spectral data including IR, HR-EI-MS, 1D and 2D NMR.
Assuntos
Asteraceae/química , Derivados de Benzeno/isolamento & purificação , Derivados de Benzeno/química , Ésteres , Hexanos , Estrutura Molecular , Ressonância Magnética Nuclear Biomolecular , PaquistãoRESUMO
Salsolins A (1) and B (2), the new triterpenes, have been isolated from the chloroform soluble fraction of Salsola baryosma along with 2alpha,3beta,23,24-tetrahydroxyurs-12-en-28-oic acid (3) reported for the first time from this species. Their structures have been assigned from 1H and 13C NMR spectra, DEPT and by 2D COSY, NOESY, HMQC and HMBC experiments. The compounds 1-3 showed significant antioxidant activity.
Assuntos
Antioxidantes/química , Espectroscopia de Ressonância Magnética/métodos , Salsola/química , Alcaloides de Salsolina/química , Triterpenos/química , Antioxidantes/isolamento & purificação , Deutério , Estrutura Molecular , Oxirredução , Alcaloides de Salsolina/isolamento & purificação , Triterpenos/isolamento & purificaçãoRESUMO
Keeping in view the interesting chemistry and pharmacological importance of harmine series of bases -- the beta-carboline alkaloids, a number of new derivatives of tetrahydroharmine and harmalol have been prepared and characterized through spectral studies. Some of these derivatives showed spasmolytic activity. It was observed that all the N-acyl tetrahydroharmine derivatives are stable, not labile and no ring opening occurs in these compounds, as reported recently.
