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US 2006/0079702 A1Published application
Process for making estra-4,9(10)-diene steroids
OwnerVerlan Van Rheenen, Edward Hesslerinventors
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Abstract
A process for preparation of steroidal estra-4,9(10)-diene-3,17-diones of structure (V) by treatment of steroidal estra-5(10),9(11)-diene-3,17-diones of structure (VI) with concentrated mineral acid. In one embodiment, the mineral acid is concentrated phosphoric acid.
Claims3
1-17. (canceled)
A process for preparation of steroidal estra-4,9(10)-diene-3,17-diones of structure (V) by treatment of steroidal estra-5(10),9(11)-diene-3,17-diones of structure (VI) with concentrated mineral acid.
Dependencies are inferred from the claim text.