Method for the production of d-threo-2-phenyl-2-piperidine-2-yl acetate
CA 2513951 C · Owner: Wollenweber, Markus · Inventors: Trafelet, Huldreich; Wollenweber, Markus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a method for producing , d-threo-R(R*,R*)-2-phenyl-2--piperidine-2-yl acetate and the acid addition salts thereof by , converting d-threo-R(R*,R*)-2-phenyl-2-piperidine-2-yl ethanoic acid or an acid addition salt thereof into the corresponding d-threo--R(R*,R*)-2-phenyl-2-piperidine-2-yl ethanoic acid halide producing the desired , d-threo-R(R*,R*)-2-phenyl-2-piperidine-2--yl-acetate or an acid addition salt thereof by means of , esterification and optionally recrystallizing the obtained product. The invention also relates to methods for producing pure threo-2--phenyl-2-piperidine-2-yl acetamide or the starting material for producing …
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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
- Filed January 27, 2004 and granted April 2, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 27, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 27, 2026.
- 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
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.