Process for the preparation of lactam derivatives
CA 2010963 C · Owner: Oxford, Alexander W. · Inventors: Coates. Ian H.; Hammond, Kevin I.; Oxford, Alexander W.
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 general formula (I): wherein Im represents an imidazolyl group of the formula: and R1 represents a hydrogen atom or a group selected from C1-6alkyl, C3-6alkenyl, C3-10alkynyl, C3-7cyaloalkyl C3-7cycloalkylC1-4alkyl, phenyl, phenylC1-3alkyl phenylmethoxymethyl, phenoxyethyl, phenoxymethyl -CO2R5, -COR5, -CONR5R6 or -SO2R5 (wherein R5 and R6 which may be, the same or different, each represents a hydrogen atom a, C1-6alkyl or C3-7cycloalkyl group, or a phenyl or phenylC1-4alkyl group, in which the phenyl group is optionally substituted by one or more C1-4alkyl C1-4alkoxy or hydroxy groups or halogen atoms with the, proviso …
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 February 27, 1990 and granted April 17, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 2012.
- 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.