Two new xanthone glycosides, securixanside B and C, were isolated from the stems of Securidaca inappendiculata. Their structures were determined as 3-O-b-D-glucopyranosyl- 1,7-dihydroxy-2-methoxyxanthone and 6-O-b-D-g...Two new xanthone glycosides, securixanside B and C, were isolated from the stems of Securidaca inappendiculata. Their structures were determined as 3-O-b-D-glucopyranosyl- 1,7-dihydroxy-2-methoxyxanthone and 6-O-b-D-glucopyranosyl-1-hydroxy-4,7-dimethoxyxan- thone by spectroscopic methods.展开更多
Two new saponins named davuricoside I (1) and davuricoside E (2) were isolated fromthe whole plants of Lysimachia davurica. Their structures were determined by 1D and 2D NMR,FAB-MS techniques, and chemical methods.
A new benzophenone, securiphenone A was isolated from the roots of Securidaca inappendiculata. Its structure was. determined as 2, 3-methylenedioxy-4-methoxybenzophenone by spectroscopie methods.
Starting from shikimic acid, the total synthesis of zeylenone was studied. The productwas proved to be the (+)antipode of zeylenone through analysis and comparison of their respectivespectra (including NMR, MS, IR and...Starting from shikimic acid, the total synthesis of zeylenone was studied. The productwas proved to be the (+)antipode of zeylenone through analysis and comparison of their respectivespectra (including NMR, MS, IR and CD) and optical data. The absolute configuration of thenatural product was thus determined to be (1S,2S,3R).展开更多
文摘Two new xanthone glycosides, securixanside B and C, were isolated from the stems of Securidaca inappendiculata. Their structures were determined as 3-O-b-D-glucopyranosyl- 1,7-dihydroxy-2-methoxyxanthone and 6-O-b-D-glucopyranosyl-1-hydroxy-4,7-dimethoxyxan- thone by spectroscopic methods.
基金This research was supported by the National Natural Science Foundation of China(Grant No.39870085).
文摘Two new saponins named davuricoside I (1) and davuricoside E (2) were isolated fromthe whole plants of Lysimachia davurica. Their structures were determined by 1D and 2D NMR,FAB-MS techniques, and chemical methods.
文摘A new benzophenone, securiphenone A was isolated from the roots of Securidaca inappendiculata. Its structure was. determined as 2, 3-methylenedioxy-4-methoxybenzophenone by spectroscopie methods.
文摘Starting from shikimic acid, the total synthesis of zeylenone was studied. The productwas proved to be the (+)antipode of zeylenone through analysis and comparison of their respectivespectra (including NMR, MS, IR and CD) and optical data. The absolute configuration of thenatural product was thus determined to be (1S,2S,3R).
