Method for the producing substituted-2-nitroguanidine derivatives
CA 2300808 A1 · Owner: Syngenta Participations Ag · Inventors: Maienfisch, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for producing an organic compound of formula (I) and optionally its E/Z-isomers, E/Z-isomer mixtures and/or tautomers each , in free or salt form, R1 representing hydrogen or C1-C4 alkyl R2 representing , hydrogen, C1-C6 alkyl C3-C6 cycloalkyl or a radical -CH2B, Het representing an unsubstituted or substituted heterocyclic radical and B representing phenyl, 3-pyridyl or thiazolyl, these being optionally substituted. The invention is characterised in that a compound of formula (IIa) Q-A-Q wherein , A represents a direct bond or an organic radical or of formula (IIb), wherein , U represents an organic radical Q representing (1) in the compounds (IIa) and …
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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 August 14, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 14, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 14, 2020.
- 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.