Process for preparing beta-lactam derivative and synthetic intermediate the reof
CA 2085540 A1 · Owner: Tanabe Seiyaku Co. Ltd. · Inventors: Kondo, Kazuhiko; Horikawa, Hiroshi; Iwasaki, Tameo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a process for preparing a .beta.-lactam compound represented by the formula:, (I), wherein R1 represents a hydroxy-substituted lower alkyl group or an amino group each of which may be protected; R2 represents hydrogen atom or an ester residue; X represents a methylene group which may be substituted by a lower alkyl group, sulfur atom or a group represented by the formula: -A-CH2- where A represents sulfur atom, oxygen atom or methylene group; and W represents an active ester residue of hydroxyl group, or a salt thereof, which comprises the steps of treating a 1-aza-3-thia-bicycloalkane compound represented by the formula:, (II), wherein Rl, R2 and X have the same meanlngs as …
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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 February 17, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 17, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 17, 2015.
- 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.