Process for preparing 3-(pyrid-4-yl)propanoic acid derivatives
CA 1265143 C · Owner: Adger, Brian M. · Inventors: Lewis, Norman J.; Adger, Brian M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing compounds of the formula (II): (II), and salts thereof, wherein R1 is protected hydroxy which comprises reacting an anion of the formula (III) : (III), wherein R1 is as hereinbefore defined with a compound, of the formula (IV) : X-CH2C0?M+ wherein X is a leaving group and M is a counterion, and if desired interconverting an acid of the formula (II) with a salt thereof. The products are intermediates in the preparation of histamine antagonists.
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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 January 30, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 30, 2007.
- 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.