Process for producing 1-substituted tetrahydroquinazolines
CA 2190236 C · Owner: Nishii, Shinji · Inventors: Takeuchi, Sachiko; Komatsu, Masashi; Nishii, Shinji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing 1-substituted tetrahydroquinazolines represented by the formula (III): (III) wherein Z represents a methylene group which is optionally substituted by an alkyl group; R6 represents an alkyl group or an aralkyl group; R1 and R2 independently represent a hydrogen atom a halogen atom, a nitro group, an azido group an alkyl group, an alkenyl group, an aralkyl group an alkoxy groupm, an alkoxycarbonyl group an acyloxy group, or an amino group represented by XNR4R5 in which X represents a direct bond an alkylene group or a carbonyl group, and N R4 and R5 may form together a five- or six-membered heterocyclic ring or R4 and R5 independently represent an alkyl group or an …
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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 November 13, 1996 and granted January 25, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 13, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 13, 2018.
- 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.