Intermediates for pharmaceutically active steroids
CA 1069496 A · Owner: Beecham Group Limited · Inventors: Cassidy, Frederick
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the formula (IV) are provided: (IV), wherein:, X is a protected carbonyl group: R1 is a C1-5 alkyl group a C3-6 alkenyl, group, a C3-6 cycloalkyl group or an alkylphenyl group in which the alkyl moiety is C1-3 alkyl and the phenyl moiety is optionally substituted; R2 is a hydroxyl group, or a group OR4 wherein R4 is a C2-7 acyl group a, C1-4 alkyl group, or an optionally substituted benzyl group; R3 is hydrogen or a C1-5 alkyl group; or R2 and R5 together represents an oxo group. These compounds are useful as intermediates in the preparation of certain steroids intended for the treatment of androgen dependent skin disorders.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 8, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.