1960
DOI: 10.1002/hlca.19600430123
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17α‐Corotoxigenin, 17α‐Coroglaucigenin, 17α‐Gitoxigenin, sowie vereinfachte Methode zur Herstellung von 16‐Anhydro‐gitoxigenin

Abstract: Die früher beschriebenen Reaktionsbedingungen zur Überführung von Cardenolid‐Aglykonen zu den entsprechenden 17α‐Geninen erlaubten es, aus Corotoxigenin (I) 17α‐Corotoxigenin (II) und aus Coroglaucigenin (III) 17α‐Coroglaucigenin (IV) herzustellen. Gitoxigenin (V) wurde durch Erhitzen mit Na‐Acetat und Na‐Tosylat in Dimethylformamid in 16‐Anhydro‐gitoxigenin (IX) übergeführt. 17α‐Gitoxigenin (VII) wurde erhalten, wenn V in Dimethylformamid mit Na‐Tosylat ohne Zusatz von Na‐Acetat erhitzt wurde.

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Cited by 38 publications
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“…Both 2 (10-13) and 5 (13), have been mentioiled in the literature as products based on the enzymatic rearrangement of cymarin to 17a-cymarin. A chemical method for the rearrangement of 17P-cardenolides to the 17a-epimers was first described by Reichstein et al (14,15). It co~lsists of heating the 17P-cardenolide in a solution of dimethylformamide in the presence of sodium p-toluenesulfonate and anhydrous sodium acetate.…”
mentioning
confidence: 99%
“…Both 2 (10-13) and 5 (13), have been mentioiled in the literature as products based on the enzymatic rearrangement of cymarin to 17a-cymarin. A chemical method for the rearrangement of 17P-cardenolides to the 17a-epimers was first described by Reichstein et al (14,15). It co~lsists of heating the 17P-cardenolide in a solution of dimethylformamide in the presence of sodium p-toluenesulfonate and anhydrous sodium acetate.…”
mentioning
confidence: 99%