Isolation and structure determination of cypritibetquinone A and B, two new phenanthraquinones from Cypripedium tibeticum.
OBJECTIVE
To study the chemical constituents of Cypripedium tibeticum.


METHODS
Compounds were isolated by repeated silica gel chromatography and purified on Sephadex LH-20 and structures were determined by spectral analysis.


RESULTS
Cypritibetquinones A and B were isolated from the ethyl acetate residue and their structures were determined as 7-hydroxy-2-methoxy-1 4-phenanthraquinone (1) and 7-hydroxy-2, 10-dimethoxy-l1 4-phenanthraquinone (2), respectively, by extensive spectral analyses.


CONCLUSIONS
Cypritibetquinones A and B are two new phenanthraquinones.
Liu
Dong
D
Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100094, China.
Ju
Jian-hua
JH
Zou
Zhong-jie
ZJ
Lin
Geng
G
Yang
Jun-shan
JS
D000880:Anthraquinones / Q000737:chemistry / Q000302:isolation & purification*; D008968:Molecular Conformation; D015394:Molecular Structure; D029595:Orchidaceae / Q000737:chemistry*; D010616:Phenanthrenes / Q000737:chemistry / Q000302:isolation & purification*; D010946:Plants, Medicinal / Q000737:chemistry*; D027343:Rhizome / Q000737:chemistry
D000880:Anthraquinones; D010616:Phenanthrenes; C511325:cypritibetquinone A; C511326:cypritibetquinone B