Gewinnung von 1;4-Bisdehydro-3-oxo-steroiden. Über Steroide, 139. Mitteilung
✍ Scribed by Ch. Meystre; H. Frey; W. Voser; A. Wettstein
- Publisher
- John Wiley and Sons
- Year
- 1956
- Tongue
- German
- Weight
- 582 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
A method is described which enables the production in only one chemical step of 1,4‐bisdehydro‐3‐oxo‐steroids inter alia from 3‐oxo‐ steroids saturated in ring A or from the α β‐mono‐unsaturated 3‐ketones. The dehydrogenating agent is selenium dioxide and the solvent a tertiary alcohol preferably containing some acid.
📜 SIMILAR VOLUMES
## Abstract The homolytic cleavage of 11‐hypoiodites of 3‐oxo‐11α‐hydroxy‐steroids, generated from the corresponding hydroxy compounds by treatment with lead tetraacetate and iodine, has been investigated. The main reaction products are enol ethers containing the 3‐oxo‐1, 11α‐oxido‐Δ^1^‐grouping.
## Abstract Im Zusammenhang mit weiteren Untersuchungen über die Isomerisierung von Δ^7^‐9,11α‐Oxido‐Steroiden (I) zu Δ^8^‐11‐Ketonen (II) wird die mit ausgezeichneter Ausbeute verlaufende Reduktion letzterer Verbindungen in der Ergosterin‐ und Androstanreihe zu 8,9‐gesättigten 11‐Keto‐ bzw. 11α‐Ox
Lead tetraactate treatment of 11α‐hydroxy steroids results in the formation of 1, 11α‐oxido derivatives in high yields. The configuration at C‐1 in these novel compounds is shown to depend significantly on the structure of rings A and B of their progenitors.
## Abstract The photochemical isomerisation of saturated and Δ^1^‐unsaturated 3‐oxo‐4,5‐oxido steroids to 3,5‐dioxo‐10(5→4)‐__abeo__ compounds is described.