Process for the preparation of eburnamonine derivatives
CA 1252467 A · Owner: Richter Gedeon Vegyeszeti Gyar Rt · Inventors: Czibula, Laszlo; Kalaus, Gyorgy; Nemes, Andras
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 new process for the preparation of eburnamonine derivatives of the general Formula I, (I), (wherein R1 is an alkyl group having 1-6 carbon atoms) and optical and geometrical isomers thereof which comprises reacting a hydroxyimino-octahydro-indolo2,3-aquinolizine derivative of the general Formula II, (II) (wherein R1 is as stated above and R2 stands for an alkyl group having 1-6 carbon atoms being identical with or different from R1, or a hydrogen atom) or an acid addition salt thereof in an organic protic solvent or solvent mixture with an inorganic base, optionally under the addition of water or an aqueous mineral acid at a, temperature between 60 °C and 200 °C. …
Read the whole patent
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 April 11, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 11, 2006.
- 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.