Method for producing 1-substituted 5-hydroxypyrazoles
CA 2349244 A1 · Owner: Gotz, Roland · Inventors: Gotz, Roland; Rack, Michael; Gotz, Norbert
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 method for producing substituted hydroxypyrazoles and new intermediate products. It relates in particular to a method for producing compounds of formula (I) in which R1 is hydrogen an aliphatic group , with between 1 and 8 carbon atoms C1-C6-alkoxycarbonyl, C1-C6-alkyl , thiocarbonyl or a cyclic ring system with between 3 and 14 ring atoms; R2 is hydrogen, an aliphatic group with between 1 and 8 carbon atoms; or R1 and R2 together with the carbon atom to which they are bound are a cyclic or bicyclic ring system with between 3 and 14 ring atoms. Said method comprises the production, as starting or intermediate products of compounds of formula (II) , in which …
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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 October 30, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 30, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 30, 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.