Process for producing 2-iminothiazoline derivatives and their intermediates
CA 2110652 A1 · Owner: Sumitomo Chemical Co. Ltd. · Inventors: Masumoto, Katuhisa; Nakamura, Akihiko; Yamada, Yoshimi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a process for producing a 2-iminothiazoline derivative of the general formula II, characterized in that a thiourea derivative of the general formula I is treated with an acid. The invention is further directed to a process for producing an N-substituted N-aryl-cyanamide derivative of the general formula VI, characterized in that an N-arylcyanamide derivative of the general formula IV is reacted with an allyl halide derivative of the general formula V in an aprotic polar solvent in the presence of an iodide and an alkali metal carbonate; and a process for producing an N-substituted N-arylthiourea derivative of the general formula VII, characterized in …
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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 December 3, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 3, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 3, 2015.
- 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.