VERFAHREN ZUR HERSTELLUNG VON 17ALPHA- ESTER-21-HALOGEN PREGNANEN

VERFAHREN ZUR HERSTELLUNG VON 17ALPHA- ESTER-21-HALOGEN PREGNANEN

One-step method for preparing 17 alpha -ester-21-halo pregnanes by reacting 17 alpha , 21-cyclic orthoesters of 17 alpha , 21-dihydroxy pregnanes with a halo compound in the presence of an organic polar solvent, simultaneously resulting in halogenation at 21-position and esterification at 17 alpha -...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: SEKI,TERUYA, MICHISHITA,KAZUHIKO, KAMANO,YOSHIAKI
Format: Patent
Sprache:ger
Schlagworte:
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
STEROIDS
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Beschreibung
Zusammenfassung:One-step method for preparing 17 alpha -ester-21-halo pregnanes by reacting 17 alpha , 21-cyclic orthoesters of 17 alpha , 21-dihydroxy pregnanes with a halo compound in the presence of an organic polar solvent, simultaneously resulting in halogenation at 21-position and esterification at 17 alpha -position of said 17 alpha , 21-cyclic orthoesters, the reaction proceeding in a short period of time without, or substantially without, any unfavorable side-reactions.