An improved process for lactonization in the preparation of statins
CA 2571379 C · Owner: Khanna, Jag Mohan · Inventors: Khanna, Jag Mohan; Bhadwal, Paramvir; Jaiswal, Sanjay
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to an improved and industrial friendly process for lactonization to produce compound of the Formula I from compound of the , Formula II in presence of an inorganic compound as a suitable lactonizing agent, preferably alkali metal hydrogen sulfate and crystallizing the , obtained lactone product in a solvent; or treating compound of the Formula II in the presence of an inorganic compound preferably alkali metal hydrogen sulfate using phase transfer catalyst in heterogeneous phase followed by crystallizing the obtained lactone product in a solvent.
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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 8, 2004 and granted August 7, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 8, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 8, 2026.
- 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
Timeline From CIPO dates
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.