Preparation of cephem- and isooxacephem derivatives
CA 2206199 A1 · Owner: Oberhauser, Thomas · Inventors: Oberhauser, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is concerned with a new process for the preparation of compounds of formula, (see formula I), wherein R1 is trityl, acetyl or tetrahydropyranyl; R2 is hydrogen, hydroxy, lower alkyl, cycloalkyl lower alkoxy, lower alkenyl, lower alkynyl aryl, aryloxy, aryl-lower alkyl, aryl-lower alkoxy or heterocyclyl or heterocyclyl-lower alkyl; lower alkyl, cycloalkyl, lower alkoxy, lower alkenyl cycloalkenyl, lower alkynyl, aryl-lower alkyl aryl, aryloxy, aryl-lower alkoxy, and heterocyclyl moieties being unsubstituted or substituted with at least one group selected from carboxy, amino, nitro, cyano, lower alkyl lower, alkoxy, hydroxy, halogen, -CONR21R22 -N(R22)COOR23, R22CO-, R22OCO- or …
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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 May 27, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 27, 2019.
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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.