1,3,4-oxadiazole derivatives and process for producing the same
CA 2367418 A1 · Owner: Hachiya, Katsutoshi · Inventors: Ohmoto, Kazuyuki; Kojima, Tsutomu; Hachiya, Katsutoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Oxadiazole derivatives represented by general formula (I) (wherein R1 represents hydrogen or an amino-protecting group; and R2 R3, and R4 each , independently represents alkyl cycloalkyl, optionally substituted phenyl or , 3,4-methylenedioxyphenyl, provided that R3 and R4 may in combination represent C2-6 alkylene); and a process for producing an oxadiazole derivative represented by general formula (II) (wherein all symbols have the same meanings as the above) from any of the derivatives represented by general formula (I). By the process, a compound represented by general formula (II) can be produced in high yield through a smaller number of steps.
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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 March 10, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 10, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 10, 2022.
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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.