Transformations of Glycyrrhizic Acid: XV.1 Synthesis of Triterpene Saponins with Monosaccharide Residues Attached through Ester Bonds

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Triterpene saponins, glycoside analogues of glycyrrhizic acid with a modified carbohydrate chain containing monosaccharide residues attached through ester bonds, were synthesized. To this end, peracetylated glycyrrhizic acid or its 30-methyl ester were glycosylated by 2,3,4,6-tetra-O-acetyl-α-D-gluco- or -α-D-galactopyranosyl bromide in dichloroethane in the presence of Ag2CO3. Glycerrhetinic acid saponin with D-Galp residues exhibited a higher antiulcer activity than glycyrrhizic acid in rats at a dose of 25 mg/kg.

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