An improved process for the preparation of quinolone derivatives
CA 2415040 A1 · Owner: Venkaiah, Chowdary Nannapaneni · Inventors: Venkaiah, Chowdary Nannapaneni; Pulla, Reddy Muddasani
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to an improved process for the preparation of quinolone drugs of the formula (I) wherein R=C¿1?-C¿6? alkyl, C¿3?-C¿6? cycloalklyl aryl, substituted aryl, NR?1¿R?2¿=diarylamino arylalkylamino, C¿1?-C¿6?-dialkylamino piprazinyl, N or C alkyl (C¿1?-C¿6?) substituted piperazinyl morpholino, pyrrolidinyl, substituted pyrrolidinyl aralkyl, substituted aralkyl etc. Some of the compounds falling within the formula (I) are ciprofloxacin enrofloxin, pefloxacin, etc. These compounds are useful as antibacterial drugs. The process of the present invention for preparation of compound of formula (I) comprises in enhancing the reactivity of the displaceable halogen (X) in the …
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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 19, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 19, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 2023.
- 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.