Die Struktur der Drevogenine. 3. Mitteilung Struktur von Drevogenin A, B und D. Glykoside und Aglykone, 279. Mitteilung

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Abstract
The treatment of drevogenin P with isovaleryl chloride in pyridine gave an amorphous 3,12‐di‐O‐isovaleryl‐drevogenin P (4), which, on energetic acetylation, was converted into 3‐O‐isovaleryl‐drevogenin A (5). This could be isolated in crystalline form and was converted through mild alkaline hydrolysis into drevogenin A. Hence drevogenin A could be classified as 11‐O‐acetyl‐12‐O‐isovaleryl‐drevogenin P. Indirectly, the structure of drevogenin B could be deduced to be most probably that of 11α‐mono‐O‐acetyl‐drevogenin P. Some details of the earlier given structures [1] are corrected here. Drevogenin D has an 11α‐hydroxyl group.