Processes for preparation of steroid derivatives
CA 1055015 A · Owner: Wisconsin Alumni Research Foundation · Inventors: Eguchi, Yukuo; Suda, Tatsuo; Ishikawa, Masayuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of 1a-hydroxycholecalciferol characterized by reacting cholesta-1,5,7-trien-3.beta.-ol with a triazoline-3,5-dione to form a 1,4-cyclized adduct thereof, oxidizing the adduct with a peroxide to form the corresponding 1.alpha.2.alpha.-epoxide reducing said epoxide to cholesta-, 5,7-diene-1.alpha.3.beta.-diol which is then subjected to radiation with ultraviolet rays to give 1.alpha.3.beta.-dihydroxyprevitamin D3 which is allowed to stand still in the dark thereby producing 1.alpha.-hydroxycholecalciferol. The cholesta-1,5,7-trien-3.beta.-ol used as starting material is valuable as an intermediate and is prepared by isomerizing cholesta-1,4,6-trien-3-one in the …
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 May 22, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 22, 1996.
- 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.