Process for the preparation of pyridinecarboxylic acid piperazides
CA 1103252 A · Owner: Egyt Gyogyszervegyeszeti Gyar · Inventors: Budai, Zoltan; Lay, Aranka (Nee Konya); Mezei, Tibor
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 pyridinecarboxylic acid piperazides having the general formula I, (I), and their acid addition salts. In the general formula I R1 stands for a methyl or a benzyl group. These compounds are prepared by reacting an organic or inorganic salt of pyridinecarboxylic acid with a chloroformic acid ester of the general formula III, (III), wherein R stands for an alkyl having from 1 to 3 carbon atoms in the presence of an inert solvent and the, compound of the general formula IV (IV), obtained, wherein R has the same meaning as defined above is further reacted with a substituted piperazine of the general formula V, (V), wherein R1 has 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 June 16, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 16, 1998.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.