Process for the production of 5-hydroxyoxazolidinones
CA 2243498 A1 · Owner: Zeneca Limited · Inventors: Cox, John Michael; Vohra, Shaheen Khatoon; Mitchell, Glynn
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for the production of a hydroxyoxazolidinone of formula (I) wherein A represents optionally substituted phenyl; which process comprises the step of treating a hydroxythiazolidinone of formula (II) in which A is as defined for formula (I); with an oxidising agent. The compounds of formula (I) may be used as intermediates in the synthesis of herbicidally active compounds.
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 January 17, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 17, 2019.
- 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.