Process for producing erythro-3-amino-2-hydroxybutyric acid derivatives
CA 2312385 A1 · Owner: Hinoue, Kazumasa · Inventors: Hinoue, Kazumasa; Yaegashi, Keisuke; Furukawa, Yoshiro
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 process for reacting .alpha.~aminoaldehyde derivatives having a sterically bulky amino group which are, commercially available with a metal cyanide in the presence of an acid chloride, an acid anhydride or the like to synthesize 3-amino-2-hydroxybutyronitrile derivatives in high yields and high erythro selectivity. When optically active .alpha.~aminoaldehyde derivatives are used racemization hardly occurs during the reaction and the desired products are, obtained in high optical purity.
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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 21, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 21, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 21, 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.