Triterpenoid Saponins from the Leaves of Ilex kudingcha

Aim: To study the chemical constituents of the leaves of Ilex kudingcha C. J. Tseng. Methods: Compounds were isolated by column chromatography with silica gel and preparative HPLC. Their structures were identified on the basis of physicochemical properties and spectroscopic analysis. Results: Three triterpenoid saponins were isolated and identified as 3-O-α-L- rhamnopyranosyl-(1→2)-α-L-arabinopyranosyl pomolic acid 28-O-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranosyl ester (1), 3-O-α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyranosyl-α-kudinlactone (2) and 3-O-β-D-glucopyranosyl-β-kudinlactone (3). Conclusion: Compound 1 is a new triterpenoid saponin.