Process for the preparation of n,n'-bis-(alkoxyalkyl)-pyridine-2,4-dicarboxamides
CA 1330802 C · Owner: Hoechst Aktiengesellschaft · Inventors: Baader, Ekkehard; Burghard, Harald; Bickel, Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved process for the preparation of N,N'-bis- (alkoxyalkyl)-pyridine-2,4-dicarboxamides The invention relates to an improved process for the preparation of N,N'-bis(alkoxyalkyl)-pyridine-2,4-dicarboxamides and to the use of these compounds for the preparation of pharmaceuticals which can be administered orally. In the process according to the invention the compounds of the formula I, (I), in which R1 denotes C1-C4-alkyl which is monosubstituted by C1-C4-alkoxy are obtained by firstly A) reacting pyridine-2,4-dicarboxylic acid in toluene with a 2-3-fold excess of SOCl2 at temperatures of 90-110°C, dissolving the resulting intermediate in dioxane, and, B) adding dioxane to 4 times the …
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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 July 19, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 19, 2011.
- 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.