A new triterpene and a saponin, named 2α,3β23-trihydroxyurs-20-en-28-oic acid (1) and 2α,3β,23-trihydroxyurs-20-en-28-oic acid O-α-L-rhanmopyranosyl-(1→4)-O-β-D-glucopyranosyl-(1→6)-O-β-D-glucopyranosyl...A new triterpene and a saponin, named 2α,3β23-trihydroxyurs-20-en-28-oic acid (1) and 2α,3β,23-trihydroxyurs-20-en-28-oic acid O-α-L-rhanmopyranosyl-(1→4)-O-β-D-glucopyranosyl-(1→6)-O-β-D-glucopyranosyl ester (2), have been isolated from the aerial part of CenteUa asiatica. Their structures were elucidated by spectral methods, including 2D-NMR spectra.展开更多
AIM: To investigate the chemical constituents of Fitex negundo. METHOD: Compounds were isolated by different chromatographic methods and their structures were elucidated on the basis of NMR spectroscopy. RESULTS: F...AIM: To investigate the chemical constituents of Fitex negundo. METHOD: Compounds were isolated by different chromatographic methods and their structures were elucidated on the basis of NMR spectroscopy. RESULTS: Four compounds were isolated and identified as 2a, 3a, 24-trihydroxyurs-12, 20(30)-dien-28-oic acid-28-O- β-D-glucopyranosyl ester (1), corosolic acid (2), vulgarsaponin A (3) and 2a, 3a, 24-trihydroxyurs-12-en-28-oic acid-28-O-β-D- glucopyranosyl ester (4), respectively. CONCLUSION: Compound I is a new triterpenoid glycoside.展开更多
文摘A new triterpene and a saponin, named 2α,3β23-trihydroxyurs-20-en-28-oic acid (1) and 2α,3β,23-trihydroxyurs-20-en-28-oic acid O-α-L-rhanmopyranosyl-(1→4)-O-β-D-glucopyranosyl-(1→6)-O-β-D-glucopyranosyl ester (2), have been isolated from the aerial part of CenteUa asiatica. Their structures were elucidated by spectral methods, including 2D-NMR spectra.
基金supported by the Program for Changjiang Scholars and Innovative Research Team in the University(No.IRT0965)the Team Project of Natural Science Foundation of Guangdong Province(No.8351063201000003)the Science and Technology Planning Project of Guangdong Province(No.2012A080204005)
文摘AIM: To investigate the chemical constituents of Fitex negundo. METHOD: Compounds were isolated by different chromatographic methods and their structures were elucidated on the basis of NMR spectroscopy. RESULTS: Four compounds were isolated and identified as 2a, 3a, 24-trihydroxyurs-12, 20(30)-dien-28-oic acid-28-O- β-D-glucopyranosyl ester (1), corosolic acid (2), vulgarsaponin A (3) and 2a, 3a, 24-trihydroxyurs-12-en-28-oic acid-28-O-β-D- glucopyranosyl ester (4), respectively. CONCLUSION: Compound I is a new triterpenoid glycoside.