Novel steroid 5-reductase inhibitors
Patent 4317817 Issued on March 2, 1982. Estimated Expiration Date: 
December 15, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 15, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDual channel automatic picture sharpness control 21-Acetals and mixed acetals of steroidal 21-aldehydes, intermediates and methods of preparation Patent #: 4011315 InventorsAssigneeApplicationNo. 06/216112 filed on 12/15/1980US Classes:514/150, Acyclic nitrogen double bonded to acyclic nitrogen, acyclic nitrogen triple bonded to acyclic nitrogen or azide DOAI534/556, Diazooxide or diazotate (e.g., -N=N-0-, etc.)552/505, Boron, silicon, selenium or tellurium containing552/516, The nitrogen is double bonded to the cyclopentanohydrophenanthrene ring system552/555, Exactly one oxygen bonded directly to the cyclopentanohydrophenanthrene ring system (e.g., 3-keto-bisnorcholenic acids, 3-keto-bisnor-cholene-22 als, etc.)552/603, Carbon or halogen bonded directly at the 1-, 2-, 3-, 4- or 5-position552/611, Exactly one oxygen bonded directly to the cyclopentanohydrophenanthrene ring system (e.g., 3-keto-etiocholanic acids, etc.)552/635Carbon or halogen bonded directly at the 2- or 4-positionExaminersPrimary: Roberts, Elbert L.Attorney, Agent or FirmInternational ClassesC07J 41/00 (20060101)C07J 17/00 (20060101) C07J 31/00 (20060101) C07J 1/00 (20060101) C07J 51/00 (20060101) C07J 21/00 (20060101) C07J 3/00 (20060101) C07J 9/00 (20060101) AbstractCompounds of the following general formula are testosterone 5-reductase inhibitors rendering the compounds useful in the treatment of acne and oily skin and benign prostatic hypertrophy: ##STR1## wherein R is: =O, --OH, --OCO--alkyl C1-5, --COOH, --CH2 OH, --COO--alkyl C1-6, --COCH3, ##STR2##Other References
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