Process for the preparation of 3-(4-bromo-2- fluorophenyl)methyl-3,4-dihydro-4-oxo-1- phthalazine-acetic acid
CA 1300142 C · Owner: Shuman, Richard F. · Inventors: Shuman, Richard F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved Process for the Preparation of 3-(4-Bromo-2fluorophenyl)methyl-3,4-dihydro-4-oxo-1-phthalazineacetic Acid. ABSTRACT OF THE DISCLOSURE There is disclosed an improved process for the preparation of 3-(4-bromo-2-fluorophenyl)methyl-3,4-dihydro-4-oxo-1-phthalazineacetic acid. The process is significantly improved over the prior art process in preparing the product in a one-step process where the prior art required three steps. The instant process directly alkylates a phthalazine ring nitrogen in the presence of the acetic acid moiety without the necessity of protecting the carboxylic acid group as was necessary in the prior art preferred process. The product is useful for treating the …
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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 May 5, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 5, 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.