New Eremophilenolides from the Rhizomes of Petasites japonicus MAXIM.
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Four new eremophilenolides, (15R)-6β-angeloyloxy-3β, 15-epoxy-9β,15-dihydroxyeremophil-7(11)-en-12,8<ar-olide (1), 6β-(3'-chloro-2'-hydroxy-2'-methylbutyroyloxy)-3β, 8β-dihydroxyeremophil-7-(11)-en-12,8α-olide (2), 3β,6β-dihydroxyeremophil-7(11)-en-12,8α-olide (3) and 6β,8β-dihydroxy-3-oxoeremophil-7(11)-en-12,8α-olide (4), were isolated from dried rhizomes of Petasites japonicus Maxim. (Compositae) together with uridine (5). The structures of these compounds were elucidated on the basis of spectroscopic evidences. Compound 1 is an eremophilenolide derivative having a five-membered hemi-acetal ring formed between C-3 hydroxyl group and C-15 methyl group, which has not been known before.
- 日本生薬学会の論文
- 1996-02-20
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