A new flavanone from Dryopteris sublaeta.
OBJECTIVE
To study the chemical constituents of Dryopteris sublaeta Ching et Hsu.


METHODS
Fresh plant of Dryopteris sublaeta Ching et Hsu was extracted twice with boiling water, the extract was concentrated to small volume under reduced pressure at 50 degrees C. The concentrated material was partitioned with ether, ethyl acetate, and n-butanol. The fraction of ether extract was chromatographed over silica gel column. The compounds were identified on the basis of their physiochemical and spectral data.


RESULTS
Four compounds were obtained and identified as 2 (S)-5, 7, 3'-trihydroxy-6, 8-dimethyl-5'-methoxyflavanone (1), matteucinol (2), desmethoxymatteucinol (3) and 5, 7, 2'-trihydroxy-6, 8-dimethylflavanone (4).


CONCLUSIONS
Compound 1 is a new one, the others were isolated from Dryopteris for the first time.
Feng
Wei-sheng
WS
Henan College of Traditional Chinese Medicine, Zhengzhou 450008, China. fwsh@hactcm.edu.cn
Cao
Xin-wei
XW
Zheng
Xiao-ke
XK
Kuang
Hai-xue
HX
D002867:Chromones / Q000737:chemistry / Q000302:isolation & purification; D032492:Dryopteris / Q000737:chemistry*; D044950:Flavanones / Q000737:chemistry / Q000302:isolation & purification*; D008968:Molecular Conformation; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*
C514834:2(S)-5,7,3'-trihydroxy-6,8-dimethyl-5'-methoxyflavanone; D002867:Chromones; D044950:Flavanones; C049059:matteucinol