Oligostilbenes have attracted much interest due to their intricate structures and diverse bioactivities.In this study,two stilbene dimers,(−)-7,8-cis-ε-viniferin(1)and carasiphenol A(2),and two trimers,suffruticosol ...Oligostilbenes have attracted much interest due to their intricate structures and diverse bioactivities.In this study,two stilbene dimers,(−)-7,8-cis-ε-viniferin(1)and carasiphenol A(2),and two trimers,suffruticosol A(3)and suffruticosol C(4),were investigated by electrospray ionization ion-trap time-of-flight multistage mass spectrometry(ESI-IT-TOF-MS^(n)).Based on the MS^(n) study,the fragmentation pathways and diagnostic ions of four oligostilbenes in both positive and negative modes were proposed.The consecutive elimination of phenol(C_(6)H_(6)O)and resorcinol(C_(6)H_(6)O_(2))moieties were the particular dissociation for oligostilbenes due to the presence of 1,2-diphenylethylene nucleus.The present MS^(n) fragmentation study will provide valuable information for the fast characterization of oligostilbenes from complicated natural mixtures.展开更多
A new resveratrol trimer. amurensin G (1), was isolated from the roots of Vitis amurensis Rupr. Its structure and relative configuration were established on the basis of spectral evidence. especially on HMBC spectrum ...A new resveratrol trimer. amurensin G (1), was isolated from the roots of Vitis amurensis Rupr. Its structure and relative configuration were established on the basis of spectral evidence. especially on HMBC spectrum and NOE difference experiments.展开更多
A novel tetrastilbene, davidol A, was isolated from the stems of Vitis davidii together with the previously known resveratrol, (+)-epsilon-viniferin; ampelopsin C; ampelopsin E; vitisin A and hopeaphenol. Its structur...A novel tetrastilbene, davidol A, was isolated from the stems of Vitis davidii together with the previously known resveratrol, (+)-epsilon-viniferin; ampelopsin C; ampelopsin E; vitisin A and hopeaphenol. Its structure was elucidated mainly by 1D and 2D NMR analyses.展开更多
基金This work was financially supported by the National Natural Science Foundation of China(81773609)the Program of Yunling Scholarship,and the Applied Basic Research Programs of Yunnan Province(2017FB137).
文摘Oligostilbenes have attracted much interest due to their intricate structures and diverse bioactivities.In this study,two stilbene dimers,(−)-7,8-cis-ε-viniferin(1)and carasiphenol A(2),and two trimers,suffruticosol A(3)and suffruticosol C(4),were investigated by electrospray ionization ion-trap time-of-flight multistage mass spectrometry(ESI-IT-TOF-MS^(n)).Based on the MS^(n) study,the fragmentation pathways and diagnostic ions of four oligostilbenes in both positive and negative modes were proposed.The consecutive elimination of phenol(C_(6)H_(6)O)and resorcinol(C_(6)H_(6)O_(2))moieties were the particular dissociation for oligostilbenes due to the presence of 1,2-diphenylethylene nucleus.The present MS^(n) fragmentation study will provide valuable information for the fast characterization of oligostilbenes from complicated natural mixtures.
文摘A new resveratrol trimer. amurensin G (1), was isolated from the roots of Vitis amurensis Rupr. Its structure and relative configuration were established on the basis of spectral evidence. especially on HMBC spectrum and NOE difference experiments.
文摘A novel tetrastilbene, davidol A, was isolated from the stems of Vitis davidii together with the previously known resveratrol, (+)-epsilon-viniferin; ampelopsin C; ampelopsin E; vitisin A and hopeaphenol. Its structure was elucidated mainly by 1D and 2D NMR analyses.
