Process for producing norstatin derivatives
CA 2309530 A1 · Owner: Fujii, Akio · Inventors: Inoue, Kenji; Sugawara, Masanobu; Fujii, Akio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention to provide a process for producing an optically active threo-phenylnorstatin derivative which does not require a toxic cyanating agent or a costly reagent or a, complicated procedure, and can be practiced on a commercial scale. This invention is directed to a process for producing a .beta.-amino-.alpha.-hydroxy acid derivative which comprises treating either a .gamma.-amino- .beta.-keto sulfoxide derivative with a halogenating agent to produce a .gamma.-amino-.alpha.-halo-.beta.-keto sulfoxide derivative treating the, same with an acid and an alcohol to produce a .beta. -amino- .alpha. -keto ester derivative or .beta.-amino- .alpha.-keto acid derivative and, followed by …
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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 May 25, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 25, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 25, 2022.
- 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.