Process for producing quinazoline derivatives
CA 2283514 A1 · Owner: Tsuboi, Hiroyuki · Inventors: Goto, Shunsuke; Fukagawa, Masayasu; Omori, Hiroki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing quinazoline derivatives of general formula (I) or salts thereof on an industrial scale, wherein R1 represents hydrogen or halogen; R2 represents carboxyl or protected carboxyl; and A represents lower alkylene, by reacting a compound of the general formula (II): C1-A-R2 wherein , R1 is as defined above, or a salt thereof with a silylating agent and then with a compound of general formula (III) wherein R1 and A are each as defined , above or a salt thereof and, if necessary, desilylating the product.
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 March 17, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 17, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 17, 2020.
- 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.