Process for production of pyrazole compounds
CA 2467115 A1 · Owner: Nishiguchi, Atsuko · Inventors: Nishiguchi, Atsuko; Ikemoto, Tomomi; Tawada, Hiroyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process by which pyrazole compounds useful as intermediates in the preparation of drugs such as diabetes remedies can be easily produced in high yield, specifically, a process for the production of compounds represented by the general formula (I) or salts thereof: (I) wherein R1 is a hydrocarbon group which may be substituted; and n is an integer of 1 to 4 characterized , by reacting a compound represented by the general formula (II) or a salt thereof with hydrazine or a salt thereof: (II) wherein Q is optionally substituted hydroxyl or optionally substituted amino; R is a hydrocarbon group which may be substituted; and n and R1 are each as defined above.
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 November 12, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 12, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 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
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.