Process for the preparation of l-phosphinothricin and its derivatives
CA 2085145 A1 · Owner: Zeiss, Hans-Joachim · Inventors: Zeiss, Hans-Joachim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, Process for the preparation of L-phosphinothricin and its derivatives, The invention relates to a process for the enantioselective preparation of L-phosphinothricin (L-Ptc) and derivatives of the formula I, (I), in which R1 is H (C1-C6)-alkyl, (C1-C4)-haloalkyl, (C3-C6)-cycloalkyl or (subst.) phenyl-(C1-C4)-alkyl R2 is, hydrogen, formyl, (C1-C6)alkylcarbonyl (C1-C6)alkoxy-, carbonyl, (subst.) benzyloxycarbonyl (C1-C6)-alkyl-, sulfonyl or (subst.) (C6-C10)-arylsulfonyl and R3 is OH, NH2 or (C1-C6)-alkoxy, or their salts with acids or bases in which, a) an L-vinylglycine derivative II is reacted with a methanephosphonous acid monoester III, (II) (III), in which R4 is defined as R1 …
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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 11, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 11, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 11, 2014.
- 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.