Process for preparing optically active epoxides
CA 2400514 A1 · Owner: Justice, David Edward · Inventors: Justice, David Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a process for the production of optically active epoxides useful as pharmaceutical intermediates particularly in the field of , HIV protease inhibitors. The optically active epoxides are produced in commercially acceptable yields from an optically active alcohols by a Mitsunobu reaction and a cyclisation step preferably comprising an , intermediate recrystallisation step. The stereochemistry of the alcohol is inverted during the Mitsunobu reaction to produce the desired epoxide.
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
- Filed September 18, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 18, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 18, 2023.
- 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.