Phytochemical analysis of the polar extracts of the leaves of Helleborus viridis (Ranunculaceae) resulted in the isolation of two new furostanol saponins (25R)-26-[(alpha-L-rhamnopyranosyl)oxy]-22alpha-methoxyfurost-5-en-3beta-yl O-beta-D-glucopyranosyl-(1 --> 3)-O-[6-acetyl-beta-D-glucopyranosyl-(1 --> 3)]-O-beta-D-glucopyranoside (1) and (25R)-26-[(alpha-L-rhamnopyranosyl)oxy]-22alpha-methoxyfurost-5-en-3beta-yl O-beta-D-glucopyranosyl-(1 --> 3)-O-beta-D-glucopyranosyl-(1 --> 3)- O-beta-D -glucopyranoside (2) and three new quercetin glycosides, quercetin 3-O-(2-E-caffeoyl)-alpha-L-arabinopyranosyl-(1 --> 2)-beta-D-galactopyranoside-7-O-beta-D-glucopyranoside (3), quercetin 3-O-(2-E-caffeoyl)-alpha-L-arabinopyranosyl-(1 --> 2)-beta- D-galactopyranoside (4), and quercetin 3-O-alpha-L-arabinopyranosyl-(1 --> 2)-beta-D-galactopyranoside (5). The structures of the new compounds were determined by spectroscopic analysis, including 2D NMR data and mass spectrometry.
Furostanol saponins and quercetin glycosides from the leaves of Helleborus viridis L. / A. Braca, J.M. Prieto, N. De Tommasi, F. Tomè, I. Morelli. - In: PHYTOCHEMISTRY. - ISSN 0031-9422. - 65:21(2004), pp. 2921-2928.
Furostanol saponins and quercetin glycosides from the leaves of Helleborus viridis L.
F. TomèPenultimo
;
2004
Abstract
Phytochemical analysis of the polar extracts of the leaves of Helleborus viridis (Ranunculaceae) resulted in the isolation of two new furostanol saponins (25R)-26-[(alpha-L-rhamnopyranosyl)oxy]-22alpha-methoxyfurost-5-en-3beta-yl O-beta-D-glucopyranosyl-(1 --> 3)-O-[6-acetyl-beta-D-glucopyranosyl-(1 --> 3)]-O-beta-D-glucopyranoside (1) and (25R)-26-[(alpha-L-rhamnopyranosyl)oxy]-22alpha-methoxyfurost-5-en-3beta-yl O-beta-D-glucopyranosyl-(1 --> 3)-O-beta-D-glucopyranosyl-(1 --> 3)- O-beta-D -glucopyranoside (2) and three new quercetin glycosides, quercetin 3-O-(2-E-caffeoyl)-alpha-L-arabinopyranosyl-(1 --> 2)-beta-D-galactopyranoside-7-O-beta-D-glucopyranoside (3), quercetin 3-O-(2-E-caffeoyl)-alpha-L-arabinopyranosyl-(1 --> 2)-beta- D-galactopyranoside (4), and quercetin 3-O-alpha-L-arabinopyranosyl-(1 --> 2)-beta-D-galactopyranoside (5). The structures of the new compounds were determined by spectroscopic analysis, including 2D NMR data and mass spectrometry.
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