5 NEW TRITERPENE SAPONINS, POLYGALASAPONINS XXVIII-XXXII FROM THE ROOT OF POLYGALA-JAPONICA HOUTT

Five new oleanane-type saponins, polygalasaponins XXVIII-XXXII, along with one known saponin, polygalasaponin XXIV, and one known acylated s ucrose, tenuifoliside C, were isolated from the root of Polygala japon ica. The structures of these new compounds were elucidated as 3-O-beta -D-glucopyranosyl presenegenin 28-O-beta-D-xylopyranosyl (1 --> 4)-alp ha-L-rhamnopyranosyl (1 --> 2)-beta-D-fucopyranosyl ester, 3-O-beta-D- glucopyranosyl presenegenin 28-O-beta-D-galactopyranosyl (1 --> 5)-bet a-D-apiofuranosyl (1 --> 4)-beta-D-xylopyranosyl (1 --> 4)-alpha-L-rha mnopyranosyl (1 --> 2)-beta-D-fucopyranosyl ester, 3-O-beta-D-glucopyr anosyl presenegenin 28-O-beta-D-galactopyranosyl (1 --> 4)-beta-D-xylo pyranosyl (1 --> 4)-alpha-L-rhamnopyranosyl (1 --> 2)-[4-O-p-methoxyci nnamoyl]-[beta-D-glucopyranosyl (1 --> 3)]-beta-D-fucopyranosyl ester, 3-O-beta-D-glucopyranosyl presenegenin 28-O-alpha-L-arabinopyranosyl (1 --> 3)-beta-D-xylopyranosyl (1 --> 4)-(beta-D-apiofuranosyl (1 --> 3)]-alpha-L-rhamnopyranosyl (1 --> -O-3,4,5-trimethoxycinnamoyl]-beta- D-fucopyranosyl ester, 3-O-beta-D-glucopyranosyl presenegenin 28-O-alp ha-L-arabinopyranosyl (1 --> 3)-beta-D-xylopyranosyl (1 --> 4)-[beta-D -apiofuranosyl (1 --> 3)-alpha-L-rhamnopyranosyl (1 --> -[4-O-p-methox ycinnamoyl]-[alpha-L-rhamnopyranosyl (1 --> 3)]-beta-D-fucopyranosyl e ster, respectively, on the basis of spectroscopic and chemical evidenc e.