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Note | Regular issue | Vol 65, No. 4, 2005, pp.887-891
Published online, 10th February, 2005
DOI: 10.3987/COM-05-10337
Eremopetasitenin A3 and 8-Oxoeremophil-6-en-12-oic Acid from Petasites japonicus ssp. giganteus

Motoo Tori,* Moeko Kume, Katsuyuki Nakashima, Masakazu Sono, and Masami Tanaka

*Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima, 770-8514, Japan


Seven eremophilane-type sesquiterpenes have been isolated from Petasites japonicus ssp. giganteus collected in Hokkaido, and two of them have been found to be new. Eremopetasitenin A3 was a lactone containing an epoxide at the C-7 and C-8 positions, whose structure was established mainly based on spectroscopic evidence including 2D NMR spectra. The other one was an eremophilane-type carboxylic acid.