ABSTRACT
Besides rutin, quercetin 3-rhamnoside and kaempferol 3-rhamnosyl(1-->6) galactoside, a new flavonol glycoside, quercetin 3-glucosyl(1-->4)galactoside, and 1,6,8-trihydroxy-3-methyl anthraquinone (emodin) have been characterized from leaves of Rumex chalepensis. The structures were established on the basis of Rf values, acid hydrolysis to aglycone and sugar and UV, EI and FAB-mass spectra, 1H NMR, 13C DEPT NMR, NOE difference measurement, 1H-H COSY and 1H-13C COSY spectral data.
Subject(s)
Anthraquinones/chemistry , Flavonoids/chemistry , Glycosides/chemistry , Plants/chemistry , Anthraquinones/isolation & purification , Carbohydrate Conformation , Carbohydrate Sequence , Flavonoids/isolation & purification , Glycosides/isolation & purification , Magnetic Resonance Spectroscopy , Molecular Sequence Data , Spectrometry, Mass, Fast Atom Bombardment , Spectrophotometry, Ultraviolet , Structure-Activity RelationshipABSTRACT
From the aerial parts of THYMUS SATUREIOIDES, two flavonoids, new for this species, have been identified: 5-hydroxy-6,7,3',4'-tetramethoxyflavone and 5,6,4'-trihydroxy-7,3'-dimethoxyflavone. This last compound has previously been isolated once from other species of Labiatae.
