Process for the preparation of benzothiophene derivatives
CA 2314699 A1 · Owner: Junghans, Bernd · Inventors: Zeibig, Thomas Albert; Junghans, Bernd; Scalone, Michelangelo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is concerned with a novel process for the preparation of the, hydroxybenzothiophene of Formula I (see formula I), comprising cyclocarbonylation of a compound of Formula II (see formula II), wherein -OR is as defined in the specification followed by saponification. , The compound of Formula I is a building block of pharmaceutically active substances e.g. 5-, 4-2-(5-, methyl-2-phenyl-4-oxazolyl)ethoxy-7-benzothiophenylmethyl-2,4thiazolidinedione, and the corresponding sodium salt.
Read the whole patent
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 July 28, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 28, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 28, 2022.
- 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.