The bakkenolides from the root of Petasites formosanus and their cytotoxicity. |
| |
Authors: | T S Wu M S Kao P L Wu F W Lin L S Shi M J Liou C Y Li |
| |
Institution: | Department of Chemistry, National Cheng Kung University, Tainan, Taiwan. |
| |
Abstract: | Thirty-two new bakkenolides, bakkenolides-Db (1)--Dh(7), -Fa(8), -Fb(9), -I(10)--M(14), -Na(15), -Nb(16), -O(17)--T(22), -Ua (23), -Ub(24), -V(25)--X(27), -Ya(28), -Yb(29), -Za(30), -Zb(31) and -III(32), from the roots of Petasites formosanus together with thirty known compounds were isolated. The structures were characterized by spectral analysis. The locations, C-1 and/or C-9 of bakkenolide skeleton, of the substituents, such as acetoxy, isobutyroyloxy and isovaleroyloxy groups, can be determined by the chemical shifts of their signals and the H-1 and/H-9 in the 1H-NMR spectra. The cytotoxicity was also discussed. |
| |
Keywords: | |
|
|