32 天然多酸素含有セスキテルペンラクトン類の構造

概要

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The efforts to study natural products for highly oxygenated sesquiterpenelactones, have resulted as obtained three novel guaianolides, Ezoartemin(II), Ezomontanin(IV), Dihydroezomontanin(V), and a novel eudesmanolide, Ezoalantonin(VII) from Artemisia feddei and A. momtana (Ezoyomogi in Japanese) both of the Compositae fam. The conformational structure of (II) has been decided by the hydrogenation of (I) which had confirmed by X-ray analysis. The configuration of (VII) has been cleared as 1,α ax, 2,α eq, and 3,α-ax, 4,α eq-diepoxyalantolide by X-ray analysis. Both of (II) and (VII) have two epoxy groups and each group is located to the same side of the same ring (A-ring). The conformational skeltones of (IV) and (V) are the same as (I), moreover, each compound has a peroxide type (-O-O-) oxygen bridge between C-1 and C-4 positions.
天然有機化合物討論会の論文
1986-09-09