Preparation of piperidinylcyclopentylheptenoic acid derivatives
CA 1292471 C · Owner: Barrett, Roger · Inventors: Judkins, Brian David; Barrett, Roger; Meerholz, Clive Alwin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Preparation of piperidinylcyclopentylheptenoic acid derivatives, A process is described for the preparation of a compound of formula (2), (2), (wherein R is a C1-6 alkyl or a C7-20 aralkyl group) and the salts thereof, which comprises reducing a compound of formula (3), (3), (or a salt thereof) using a reducing system comprising, borohydride ions and metal ions selected from lanthanide ions, alkaline earth metal ions or yttrium ions in solution. The reduction system may be provided by a borohydride (e.g. NaBH4) and a metal salt (e.g. CeC13). The ester (2) may then if desired be hydrolyzed to give the parent acid.
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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 November 26, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 26, 2008.
- 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.