Intermediate compounds for the preparation of mirtazapine and obtention methods thereof
CA 2460571 A1 · Owner: Bosch I Llado, Jordi · Inventors: Camps Garcia, Pelayo; Bosch I Llado, Jordi; Contreras Lascorz, Juan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to intermediate compounds that are used for the preparation of mirtazapine and the production methods thereof. The inventive method is used to produce (+/-)-3-phenyl-1-methylpiperazine which is an important intermediate for the production of mirtazapine. Said method consists in subjecting novel compounds having general formula (I) wherein Z is a , leaving group that can undergo nucleophilic displacement to a cyclization , reaction in the presence of a reducing agent. The invention also relates to a method of producing novel compounds having formula (I).
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
- Filed September 14, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 14, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 14, 2023.
- 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.