Preparation of triazoles by organometallic addition to ketones
CA 2228655 C · Owner: Butters, Michael · Inventors: Butters, Michael; Harrison, Julie Ann; Pettman, Alan John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a process for the preparation of a compound of formula (I), or an acid addition or base salt thereof wherein, R is phenyl optionally substituted by 1 to 3 substituents each independently selected from halo and trifluoromethyl; R1 is C1-C6 alkyl; and "Het" is pyrimidinyl optionally substituted by 1 to 3 substituents each independently selected from C1-C4 alkyl C1-C4 alkoxy, halo, oxo, ben-, zyl and benzyloxy comprising reaction of a compound of formula (II) wherein R is as previously defined for a compound of formula (I) with, a compound of formula (III), wherein R1 and "Het" are as previously defined for a compound of the formula (I) and X is chloro bromo or, iodo, in …
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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
- Filed July 26, 1996 and granted September 9, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 26, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 26, 2018.
- 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.