PROCESS FOR SYNTHESIS OF 5.alpha.-CHOLEST-8(14)-EN 3.beta.-OL-15-ONE AND OTHER 15-OXYGENATED STEROLS
CA 1287623 C · Owner: Wilson, William K. · Inventors: Kisic, Alemka; Schroepfer, George J. Jr.; Wang, Ker-Shi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing 15-oxygenated sterols such as, 3.beta.-hydroxy-5.alpha.-cholest-8(14)-ene-15 one comprising coverting, 7-dehydrocholesterol to 3.beta.-benzoyloxycholesta-5,7-diene converting, the 3.beta.-benzoyloxycholesta-5,7-diene to a 3.beta.-benzoyloxy-5-cholesta- 7,14-dience, converting the 3.beta.-benzoyloxy-5-cholesta-7,14-diene to a 3.beta.-benzoyloxy-14.alpha.15.alpha.-epoxy-5-cholest-7-ene and converting the 3.beta.-benzoyloxy-14.alpha.15.alpha.-epoxy-5-cholest-7-ene to a 15-oxygenated sterol. Preferably, the 3.beta.-benzoyloxy-cholesta-5,7-diene is converted to a 3.beta.-benzoyloxy-5-cholesta-7,14-diene by (i) contacting 3.beta.-benzoyloxy-cholesta-5,7-diene, in a solvent …
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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 August 13, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 13, 2008.
- 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.