Intermediates for the preparation of n-alkylated dipeptides and their esters
CA 1281330 C · Owner: Sanofi-Aventis Deutschland Gmbh · Inventors: Henning, Rainer; Urbach, Hansjorg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to compounds of the formula III (III), in which R1 denotes hydrogen or (C1 to C6)-alkyl which can optionally be substituted by amino (C1 to C6), acylamino or benzoylamino, (C2 to C6)-alkenyl (C3 to, C9)-cycloalkyl, (C5 to C9)-cycloalkyl (C3 to C7)-, cycloalkyl-(C1 to C4)alkyl (C6 to C12)-aryl or partially, hydrogenated aryl each of which can be substituted by, (C1 to C4) alkyl (C1 or C2)-alkoxy or halogen, (C6 -, C12)-aryl (C1 to C4)-alkyl or (C7 - C13)-aroyl-(C1 - C2)-alkyl, both of which can be substituted in the aryl radical as previously defined, a monocyclic or bicyclic heterocyclic radical having 5 to 7 or 8 to 10 ring atoms respectively, wherein 1 or 2 of these …
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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
- Granted March 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 12, 2008.
- 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
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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.