4-oxo-5n-piperidino-thiazolidin-2-ylidene acetic acid
CA 1113471 A · Owner: Warner-Lambert Company · Inventors: Herrmann, Wolfgang; Satzinger, Gerhard
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 new and chemically unique one-pot process for the preparation of thiazolidin-4-one-acetic acid derivatives of the general formula:-, (I) wherein R1 is a lower alkyl radical. In this new process the 5-bromo, derivatives of the corresponding carboxylic acid alkyl esters are prepared by reaction with elementary bromine in a solvent of low polarity. The hydrogen bromide thereby formed splits the ester bond at elevated temperatures, whereupon the 5-bromo derivatives of the free acid can be directly reacted in situ with piperidine.
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
- Granted December 1, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 1, 1998.
- 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.