Process for preparation of (s)-oxetine enantiomers
CA 2266299 A1 · Owner: Gattuso, Mark J. · Inventors: Gattuso, Mark J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
S)-oxetines are preparedin high enantiomeric purity centers on resolution using simulated, moving bed chromatography of a racemic precursor early in the oxetine synthesis. Resolution is, effected with high enantiomeric purity and subsequent reactions of the , desired enantiomer performed with high optical specificity to maintain enantiomeric purity. The undesired enantiomer, may be racemized and recycled to the resolution phase to avoid undesired losses.
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 March 23, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 23, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 23, 2021.
- 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.