Resin Glycosides. IV. Two New Resin Glycosides, Muricatins VII and VIII : from the Seeds of Ipomoea muricata

Abstract

Two resin glycosides, muricatins VII (1) and VIII (2) were isolated from the seeds of Ipomoea muricata (L.) JACQ. (Convolvulaceae). They were respectively characterized as 11R-jalapinolic acid 11-O-(4-O-(3R-hydroxy-2R-methylbutyryl))-β-D-fucopyranosyl-(1→4)-(2-O-(2S-methylbutyryl))-α-L-rhamnopyranosyl-(1→2)-β-D-quinovopyranosyl(qui')-(1→2)-β-D-quinovopyranosyl-1, 3(qui')-olide and 11R-jalapinolic acid 11-O-(α-L-rhamnopyranosyl-(1→2))-β-D-quinovopyranosyl(qui'')-(1→3)-β-D-quinovopyranosyl-(1→2)-β-D-quinovopyranosyl-1, 2(qui'')-olide on the basis of chemical and spectral data. Muricatic acid C previously obtained was also characterized as the glycosidic acid of 2.