Novel production intermediate and process for producing pyridine derivative
CA 2200604 C · Owner: Watanabe, Syotaro · Inventors: Lee, Hun Ju; Kajitani, Makoto; Kem, William R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to: (1) a compound represented by the formula (V), its tautomer and a mixture of the same; (2) a process for producing the compound represented by the above-mentioned formula (V), its tautomer or a mixture of the same, which comprises reacting N-vinylpiperidone represented by the formula (I) with a nicotinate represented by the formula (II), wherein R represents a lower alkyl group in, the presence of a sodium alkoxide; (3) a process for producing a pyridine derivative represented by the formula (III), which comprises producing the compound represented by the formula (V), its tautomer or a mixture of the same by the process as described in the above (2), and then …
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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 September 21, 1995 and granted April 10, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 21, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 21, 2017.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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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.