The preparation of enantiomerically enriched oxazolones and .alpha..alpha.-disubstituted amino acids
CA 2284591 A1 · Owner: Piquer, Javier Ariza · Inventors: Trost, Barry M.; Piquer, Javier Ariza
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Allylic electrophiles are alkylated with oxazolones in the presence of a base and catalytic quantities of a transition metal complex incorporating a chiral phosphine ligand, to yield 4,4-disubstituted-5(4H)-oxazolones. These precursors may be subsequently transformed either synthetically or enzymatically to yield enantiomerically enriched .alpha..alpha.-disubstituted amino acids.
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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 April 14, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 14, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 14, 2020.
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Timeline
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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.