Process for the preparation of n-alkylated dipeptides and their esters
CA 1338163 C · Owner: Sanofi-Aventis Deutschland Gmbh · Inventors: Wissmann, Hans; Teetz, Volker; 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 a process for the preparation of compounds of the formula I (I), in which n is 1 or 2, R denotes hydrogen or an organic radical, R1 denotes an organic radical R2 and R3 are, identical or different and denote hydrogen or an organic radical, and R4 and R5, together with the atoms bearing them, form a monocyclic, bicyclic or tricyclic heterocyclic ring system having 5 to 15 carbon atoms which process, comprises reacting compounds of the formula II defined in the description with compounds of the formula IV defined in the description, in the presence of phosphinic anhydrides of the formula III, where appropriate eliminating radicals which have been introduced to protect …
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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, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 12, 2013.
- 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.