Oxopyrrolidine compounds, preparation of said compounds and their use in the manufacturing of levetiracetam and analogues
CA 2455155 C · Owner: Marmon, Violeta · Inventors: Cavoy, Emile; Ates, Celal; Surtees, John
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 an improved process for the preparation of (S)-(-)-.alpha.-ethyl-2-oxo-1-pyrrolidine ac-etamide and analogues thereof. The invention also relates to compounds of the general formula (6) wherein R1 is methyl or ethyl ; and R2 is C2'-C4 191 alkyl, C2 191-C4 191 alkenyl or C2 191-C4 1 91 alkynyl optionally substituted by one or more halogen and their , preparation processes.
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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
- Filed August 5, 2002 and granted April 10, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 5, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 5, 2024.
- 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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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.