Optically active intermediates for the preparation of optically active substituted oximes, hydrazones and olefins useful as neurokinin antagonists
CA 2308073 A1 · Owner: Sudhakar, Anantha R. · Inventors: Tang, Suhan; Sudhakar, Anantha R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Intermediates having formulas (A) and (B) wherein BI is -CH2OH or -CH2ORP and , RP is an alcohol protecting group; a is 1 2, or 3; TI is -OH or (C); QI is , phenyl naphthyl or heteroaryl having 1-3 substituents; Ra and Rc are the same, and are H, or are selected from alkyl cycloalkyl and aryl groups, the , groups being optionally substituted with one or more substituents selected from alkyl, cycloalkyl, aryl, or -OH; or Ra and Rc together with the C-N-C chain to which they are bound, form a 5-7 membered ring; Rb and Rd are the same, and are H, or are selected from alkyl cycloalkyl and aryl groups, the , groups being optionally substituted with one or more substituents selected from …
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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 October 23, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 23, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2020.
- 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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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.