2,6-diaminopyridine compounds as intermediates for producing antibacterial dihydropyridone carboxylic acid derivatives
CA 2290709 C · Owner: Wakunaga Pharmaceutical Co. Ltd. · Inventors: Ohshita, Yoshihiro; Hirao, Yuzo; Amano, Hirotaka
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are a novel 2,6-diaminopyridine compound of the formula (C'):, (see formula I)~~~~~ , (in which X represents a nitrogen atom Y represents -CH= or, -CR7= wherein R7 represents a lower alkyl group or a halogen atom, Z represents -CH=, R2a represents a substituted or unsubstituted amino group or an amino group protected by a protective group and R3 represents a hydrogen atom or a halogen atom) and its production process. The 2,6-diaminopyridine compound is useful as an intermediate for producing a dihydro-pyridonecarboxylic acid derivative of the formula: (see formula II), (wherein R2 has the meaning of R2a; R3 X, Y and Z are as, given above; R1 is H or carboxyl protective group; R4 …
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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 20, 1996 and granted November 4, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 20, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 20, 2018.
- 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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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.