Constituents of the leaves of Woodfordia fruticosa Kurz. I. Isolation, structure, and proton and carbon-13 nuclear magnetic resonance signal assignments of woodfruticosin (woodfordin C), an inhibitor of deoxyribonucleic acid topoisomerase II.
Woodfruticosin (woodfordin C), a new cyclic dimeric hydrolyzable tannin having an inhibitory activity toward deoxyribonucleic acid (DNA) topoisomerase II, has been isolated from the leaves of Woodfordia fruticosa Kurz (Lythraceae) along with three known flavonol glycosides and three known flavonol glycoside gallates. The structure of wood fruticosin (woodfordin C) was determined by the use of two-dimensional nuclear magnetic resonance (2-D NMR) spectroscopy including heteronuclear multiple quantum coherence (HMQC) and heteronuclear multiple bond connectivity (HMBC) techniques. Detailed analyses of the proton and carbon-13 NMR (1H- and 13C-NMR) spectra of six known flavonoids were performed.
Kadota
S
S
Research Institute for Wakan-Yaku (Oriental Medicines), Toyama Medical and Pharmaceutical University, Japan.
Takamori
Y
Y
Nyein
K N
KN
Kikuchi
T
T
Tanaka
K
K
Ekimoto
H
H
D002247:Carbon Isotopes; D047348:Hydrolyzable Tannins; D009682:Magnetic Resonance Spectroscopy; D010946:Plants, Medicinal / Q000032:analysis*; D013634:Tannins / Q000032:analysis* / Q000302:isolation & purification; D059005:Topoisomerase II Inhibitors
D002247:Carbon Isotopes; D047348:Hydrolyzable Tannins; D013634:Tannins; D059005:Topoisomerase II Inhibitors; C065469:woodfordin C