A process for the preparation of zaleplon
CA 2482545 A1 · Owner: Wieczorek, Maciej · Inventors: Stawinski, Tomasz; Wieczorek, Maciej; Korycinska, Monika
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for the preparation of zaleplon (N-3(3cyanopyrazolo1,5-apyrimidin-7-yl)phenyl-N-ethyl-acetamide) in the reaction of 3-dimethylamino-1-(3-N-ethyl-N-acetylaminophenyl)-2-propen-1-one with 3aminopyrazole-4-carbonitrile, which comprises carrying out said reaction in an aqueous solution of formic acid at formic acid concentrations in the range of 20-80% (w/w). Zaleplon is useful as an anxiolytic a sedactive and a skeletal , muscle relaxant.
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 May 12, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 12, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 12, 2025.
- 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.