Structure of three new terpenoids, spiciformisins a and b, and monocyclosqualene, isolated from the herbs of Ligularia fischeri var. spiciformis and cytotoxicity.

Autor: Lee KT; College of Pharmacy, Kyung-Hee University, Seoul, 130-701 Korea., Koo SJ, Jung SH, Choi J, Jung HJ, Park HJ
Jazyk: angličtina
Zdroj: Archives of pharmacal research [Arch Pharm Res] 2002 Dec; Vol. 25 (6), pp. 820-3.
DOI: 10.1007/BF02976998
Abstrakt: The diethylether fraction from the leaves extract of Ligularia fischeri var. spiciformis (Compositae) was subjected to silica gel column chromatography and yielded three new terpenoids named spiciformisin a (1), spiciformisin b (3), and monocyclosqualene (2). Acyclic diterpenes, spiciformisin a and -b, were established as 3,7,11,15-tetramethyl-1,3(20)-hexadecadiene and 3,7,11,15-tetramethyl-1,3,6,10,14-hexadecapentaene (IUPAC), respectively. A monocyclic triterpene, monocyclosqualene, were determined as [3,8,12,16,16-pentamethyl-(3,7,11,15-hexadecatetraenyl)]-3,3,5-trimethyl-1-cyclohexene. The structures were determined on the basis of NMR and MS analysis. Spiciformicin b showed potent cytotoxicity (IC50, <9.7 microg/ml against HL-60) in contrast to no cytotoxicity (IC50, >200 microg/ml against HL-60 cells) of spiciformicin a with a cis-conjugated dienyl diexomethylene.
Databáze: MEDLINE
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