ABSOLUTE STEREOSTRUCTURES OF ALISMALACTONE 23-ACETATE AND ALISMAKETONE-A 23-ACETATE, NEW SECO-PROTOSTANE AND PROTOSTANE-TYPE TRITERPENES WITH VASORELAXANT EFFECTS FROM CHINESE ALISMATIS RHIZOMA
M. Yoshikawa et al., ABSOLUTE STEREOSTRUCTURES OF ALISMALACTONE 23-ACETATE AND ALISMAKETONE-A 23-ACETATE, NEW SECO-PROTOSTANE AND PROTOSTANE-TYPE TRITERPENES WITH VASORELAXANT EFFECTS FROM CHINESE ALISMATIS RHIZOMA, Chemical and Pharmaceutical Bulletin, 45(4), 1997, pp. 756-758
New bioactive seco-protostane and protostane-type triterpenes, alismal
actone 23-acetate and alismaketone-A 23-acetate, were isolated from Ch
inese Alismatis Rhizoma originating from Fukien province, the dried rh
izoma of Alisma orientale JUZEP. Absolute stereostructures of the new
triterpenes were determined on the basis of chemical and physicochemic
al evidence, which included chemical correlations with the known trite
rpene alisol B monoacetate. Alismalactone W-acetate and alismaketone-A
23-acetate were found to show inhibitory activity on the contractions
induced by a high concentration of K+ in isolated aortic strips from
rats.