Two new saponins from Paronychia capitata

Abstract

Two new oleanane-type triterpene glycosides, 3˗ O ˗β˗D˗glucopyranosyl˗28˗ O ˗[β˗D˗glucopyranosyl˗(1→2)˗β˗D˗xylopyranosyl˗(1→6)˗β˗D˗glucopyranosyl]medicagenic acid ( 1 ) and 3˗ O ˗β˗D˗glucopyranosyl˗28˗ O ˗[β˗D˗glucopyranosyl˗(1→6)˗β˗D˗glucopyranosyl˗(1→2)˗ β˗D˗xylopyranosyl]oleanolic acid ( 2 ), named capitatosides A and B respectively, were isolated from the butanol extract of Paronychia capitata (L.) Lam., along with seven known compounds. The structures of the isolated compounds were established by spectroscopic methods, mainly HRMS, 1D and 2D NMR ( 1 H, 13 C, COSY, HSQC, HMBC and NOESY) techniques, whereas those of the known compounds were identified by spectral comparison with reported literature data. • A phytochemical study of Paronychia capitata was carried out. • The butanol extract was investigated using chromatographic methods. • Two new oleanane-type triterpene glycosides along with seven known compounds were identified. • The structures of the isolates were established by spectroscopic methods. • The first characterization of saponosides from the genus Paronychia .