An alkaloid with a novel structure,named Hypodematine,was isolated from Hypodematium sinense Iwatsuki(belonging to Thelypterdaceae).Its structure was elucidated by means of the ~1H-~1H COSY' ~1H-^(13)C COSY and lo...An alkaloid with a novel structure,named Hypodematine,was isolated from Hypodematium sinense Iwatsuki(belonging to Thelypterdaceae).Its structure was elucidated by means of the ~1H-~1H COSY' ~1H-^(13)C COSY and long-range ~1H-^(13)C COSY spectroscopy to have the skeleton of benzo-aza-cyclooctatetraene with a phenyl substituent.Such basic structure has not been found in the na- tural product before.展开更多
The signals of 1H NMR and 13 C NMR for benzodiheteropine 1 and its cycloaddtion products 2～5 were assigned by two dimensional NMR techniques. The characteristics of their structures were analyzed and ...The signals of 1H NMR and 13 C NMR for benzodiheteropine 1 and its cycloaddtion products 2～5 were assigned by two dimensional NMR techniques. The characteristics of their structures were analyzed and discussed. The boat conformation of the seven membered heteroatomic ring in these structures was interpreted on the basis of the spectrum of NOESY as well. The coupling constants of relative protons were in accord with above results.展开更多
文摘An alkaloid with a novel structure,named Hypodematine,was isolated from Hypodematium sinense Iwatsuki(belonging to Thelypterdaceae).Its structure was elucidated by means of the ~1H-~1H COSY' ~1H-^(13)C COSY and long-range ~1H-^(13)C COSY spectroscopy to have the skeleton of benzo-aza-cyclooctatetraene with a phenyl substituent.Such basic structure has not been found in the na- tural product before.
基金The open project of State Key Laboratory of Phytochemistry and Plant Resources in West China,Kunming Institute of Botany,Chinese Academy of Sciences(P2008-KF05)the project of western doctorate foundationthe knowledge innovation project from the northwest institute of plateau biology,Chinese Academy of Sciences
文摘从阴山大戟的根部首次分到一个已知的对映-海松烷型二萜,3α,19-dihydroxyl-ent-pimara-9,15-diene,通过二维波谱方法(1 H-1 H COSY,HMBC,HMQC,ROESY)确定了其结构,并且首次此化合物的H谱和C谱数据进行了全归属.
基金Doctoral Science Foundation of Henan University of Traditional Chinese Medicine(BSJJ2011-13)the National Natural Science Foundation of China(30873363)
文摘采用二维核磁共振技术(1 H-1 H COSY,DEPT,HSQC,HMBC,NOESY)和CD光谱,确定了A环开环型芳基萘内酯类木脂素3′,4′-O,O-demethylene-4-O-demethylpodophyllotoxin(1)的结构.首次对化合物1的13C NMR数据进行了全归属.
文摘The signals of 1H NMR and 13 C NMR for benzodiheteropine 1 and its cycloaddtion products 2～5 were assigned by two dimensional NMR techniques. The characteristics of their structures were analyzed and discussed. The boat conformation of the seven membered heteroatomic ring in these structures was interpreted on the basis of the spectrum of NOESY as well. The coupling constants of relative protons were in accord with above results.
