Process for preparing cotarnine
CA 1294622 C · Owner: Mitsubishi Chemical Industries Limited · Inventors: Shimpuku, Tetsuro; Imaki, Naoshi; Shirasaka, Tadashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing cctarnine is provided which comprises oxidizing the amino group of a tetrahydroisoquinoline compound represented by the following formula (I): (I), to convert said compound into a dihydroisoquinolinium salt represented by the following formula (II): (II), wherein A- represents an anion, and then hydrolyzing said dihydroisoquinolinium salt.
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
- Granted January 21, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 21, 2009.
- 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.