Two new tirucallane-type triterpenoid saponins, Sapimukoside A (1) and Sapimukoside B (2), were isolated from the roots of Sapindus mukorossi Gaertn. On the basis of spectroscopic and chemical evidence, their structur...Two new tirucallane-type triterpenoid saponins, Sapimukoside A (1) and Sapimukoside B (2), were isolated from the roots of Sapindus mukorossi Gaertn. On the basis of spectroscopic and chemical evidence, their structures were elucidated to be 3-O-alpha-L-rhamnopyranosyl-(1-->2)-[alpha-L-arabinopyranosyl-(1-->3)]-beta-D-glucopyranosyl-21, 23R-epoxyl tirucall-7, 24R-diene-3beta, 21-diol (1) and 3-O-alpha-L-rhamnopyranosyl-(1-->6)-beta-D-glucopyranosyl-21, 23R-epoxyl tirucall-7, 24R-diene-3beta, 21-diol (2).展开更多
Two new triterpenoid saponins, monepaloside K (1) and monepaloside L (2), together with a known saponin, mazusaponin I (3), were isolated from the water-soluble part of the whole plant of Marina nepalensis var. alba H...Two new triterpenoid saponins, monepaloside K (1) and monepaloside L (2), together with a known saponin, mazusaponin I (3), were isolated from the water-soluble part of the whole plant of Marina nepalensis var. alba Hand.-Mazz. The structures of monepalosides K and L were determined to be 3-O-α-L-arabinopyranosyl-(1-3)-α-D-xylopyranosyl siaresinolic acid (1) and 3-O-β-D-glucopyranosyl-( 1-3)-β-L-arabinopyranosy1 siaresinolic acid 28-O-β-D-glucopyranosyl-(1-6)-β-D-glucopyranoside (2) respectively, on the basis of chemical and spectroscopic evidence.展开更多
Parvifloside (1), a new furostanol pentaglycoside, was isolated from the fresh rhizomes of Dioscorea parviflora C. T. Ting. On the basis of spectroscopic and chemical methods, its structure was elucidated as (25R)-26...Parvifloside (1), a new furostanol pentaglycoside, was isolated from the fresh rhizomes of Dioscorea parviflora C. T. Ting. On the basis of spectroscopic and chemical methods, its structure was elucidated as (25R)-26-O-β-glucopyranosyl-furost-5-en-3β,22ξ,26-triol 3-O-β-D-glucopyranosyl (1→3)-β-D-glucopyranosyl (1→4)-[α-L-rhamnopyranosyl (1→2)]-β-D-glucopyranoside. Six prosapogenins (2-7)were obtained from the enzymatic degradation of 1by cellulase, but only 3 and 4 were obtained by β-glucosidase. The structures of all compounds were determined by spectroscopic data. The activity of the isolated compounds on deformation of mycelia germinated from Pyricularia oaryzae P-2b conidia was evaluated.展开更多
文摘Two new tirucallane-type triterpenoid saponins, Sapimukoside A (1) and Sapimukoside B (2), were isolated from the roots of Sapindus mukorossi Gaertn. On the basis of spectroscopic and chemical evidence, their structures were elucidated to be 3-O-alpha-L-rhamnopyranosyl-(1-->2)-[alpha-L-arabinopyranosyl-(1-->3)]-beta-D-glucopyranosyl-21, 23R-epoxyl tirucall-7, 24R-diene-3beta, 21-diol (1) and 3-O-alpha-L-rhamnopyranosyl-(1-->6)-beta-D-glucopyranosyl-21, 23R-epoxyl tirucall-7, 24R-diene-3beta, 21-diol (2).
文摘Two new triterpenoid saponins, monepaloside K (1) and monepaloside L (2), together with a known saponin, mazusaponin I (3), were isolated from the water-soluble part of the whole plant of Marina nepalensis var. alba Hand.-Mazz. The structures of monepalosides K and L were determined to be 3-O-α-L-arabinopyranosyl-(1-3)-α-D-xylopyranosyl siaresinolic acid (1) and 3-O-β-D-glucopyranosyl-( 1-3)-β-L-arabinopyranosy1 siaresinolic acid 28-O-β-D-glucopyranosyl-(1-6)-β-D-glucopyranoside (2) respectively, on the basis of chemical and spectroscopic evidence.
文摘Parvifloside (1), a new furostanol pentaglycoside, was isolated from the fresh rhizomes of Dioscorea parviflora C. T. Ting. On the basis of spectroscopic and chemical methods, its structure was elucidated as (25R)-26-O-β-glucopyranosyl-furost-5-en-3β,22ξ,26-triol 3-O-β-D-glucopyranosyl (1→3)-β-D-glucopyranosyl (1→4)-[α-L-rhamnopyranosyl (1→2)]-β-D-glucopyranoside. Six prosapogenins (2-7)were obtained from the enzymatic degradation of 1by cellulase, but only 3 and 4 were obtained by β-glucosidase. The structures of all compounds were determined by spectroscopic data. The activity of the isolated compounds on deformation of mycelia germinated from Pyricularia oaryzae P-2b conidia was evaluated.
