Synthesis of homochiral 2-hydroxy acids
CA 2117340 C · Owner: Casy, Guy · Inventors: Casy, Guy; Lee, Thomas V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the production of a homochiral 2-hydroxy carboxylic acid or salt thereof corresponding to general formula (I), wherein R represents one of formulae (II) (III), (IV), (V), wherein R' represents straight- or branched-chain alkyl or phenyl optionally para-substituted with methyl methoxy, nitro or amino; and R" represents hydrogen halogen or phenyl optionally, para-substituted with methyl methoxy, nitro or amino; and M represents hydrogen or a salt-forming moiety; characterised in that it comprises reducing a corresponding 2-keto carboxylic acid or salt thereof using a (R)- or (S)-2-oxo carboxylic acid dehydrogenase inter alia, is disclosed.
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 December 23, 1992 and granted June 10, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 23, 2014.
- 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.