Resin Glycosides. VIII. : Four New Glycosidic Acids, Operculinic Acids D, E, F, and G, of the Ether-Soluble Crude Resin Glycosides ("Jalapin") from Rhizoma Jalapae Braziliensis (Roots of Ipomoea operculata)

Abstract

Four glycosidic acids, operculinic acids D, E, F and G, were isolated from the glycosidic acid fraction afforded by alkaline hydrolysis of the ether-soluble crude resin glycoside ("jalapin") from Rhizoma Jalapae Braziliensis (roots of Ipomoea operculata).They were respectively characterized as 11S-jalapinolic acid 11-O-β-D-glucopyranosyl-(1→3)-O-[α-L-rhamnopyranosyl-(1→4)]-O-α-L-rhamnopyranosyl-(1→4)-O-α-L-rhamnopyranosyl-(1→2)-β-D-xylopyranoside, 11S-jalapinolic acid 11-O-α-L-rhamnopyranosyl-(1→4)-O-α-L-rhamnopyranosyl-(1→4)-O-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranoside, 11S-jalapinolic acid 11-O-α-L-rhamnopyranosyl-(1→4)-O-α-L-rhamnopyranosyl-(1→4)-O-α-L-rhamnopyranosyl-(1→2)-β-D-xylopyranoside and 11S-jalapinolic acid 11-O-(2-O-methyl-β-D-glucopyranosyl-(1→3))-O-[α-L-rhamnopyranosyl-(1→4)]-O-α-L-rhamnopyranosyl-(1→4)-O-α-L-rhamnopyranosyl-(1→2)-β-D-fucopyranoside, on the bases of chemical and spectroscopic data.