Process for making 5-lipoxygenase inhibitors having varied heterocyclic ring systems
CA 2316748 A1 · Owner: Hnatow, Megan Elizabeth · Inventors: Hnatow, Megan Elizabeth; Norris, Timothy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is described for preparing a compound of Formula (1.3.0): (see formula I), comprising: establishing a reaction mixture consisting of (see formula II), in an aprotic solvent; in the presence of NaOH or KOH; optionally in the presence of a phase, transfer catalyst especially a quaternary ammonium salt or a phosphonium salt; followed by, heating said reaction mixture under a nitrogen atmosphere; in a preferred embodiment the aprotic solvent is DMSO the strong base in , solid form, is NaOH in powder or pellet form and the phase transfer catalyst is tetra-nbutylammonium, chloride (TBAC);, wherein the starting material of Formula (2Ø0) is prepared as follows: are reacted together in a …
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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 29, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 29, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 29, 2022.
- 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.