Asymmetric urea compound and process for producing asymmetric compound by asymmetric conjugate addition reaction with the same as catalyst
CA 2531167 C · Owner: Sumitomo Chemical Company, Limited · Inventors: Takemoto, Yoshiji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a production method of asymmetric compound (IV) which includes conjugately adding nucleophilic reagent (III) to compound (II) in the presence of asymmetric urea compound (I). The present invention provides a non-metallic asymmetric catalyst capable of realizing a highly , stereoselective asymmetric conjugate addition reaction in a high yield and an , advantageous production method of an asymmetric compound by an asymmetric conjugate addition reaction using the asymmetric catalyst (see formula II) (see formula III) (see formula I) (see formula IV) wherein X is an oxygen atom or a sulfur atom; C* C** and C*** are asymmetric , carbons; R1 R2, R4, R5, R8, …
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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 June 25, 2004 and granted May 22, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 25, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 2026.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.