Method for the preparation of esters of anhydroecgonine
CA 2215664 C · Owner: Neurosearch A/S · Inventors: Moldt, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of esters of anhydroecgonine having the formula (see formula I), any of its enantiomers or any mixture thereof or a salt thereof, wherein, R is alkyl or optionally substituted aryl, or arylalkyl; comprising the step of reacting a compound of formula (see formula II), any of its enantiomers or any mixture thereof or a salt thereof, wherein R1 is hydrogen alkyl-CO-, or optionally substituted aryl-COor , arylalkyl-CO-;, with an alcoholate RO- M+ wherein R is as defined above and M+ is a counter ion, followed by isolation of the resulting compound either as the base or if , desired, in the, form of a salt thereof.
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 March 22, 1996 and granted December 12, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 22, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 22, 2018.
- 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.