Cyclization to form cephem ring and intermediates therefor
CA 1136132 A · Owner: Shionogi & Co. Ltd. · Inventors: Yoshioka, Mitsuru; Tsuji, Teruji; Komeno, Taichiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An intermediate represented by following formula for synthesizing 3-hydroxy-3-cephem compounds. or wherein A and B each is a hydrogen or amino substituent: R is a hydrogen or thiol substituent; Hal is a halogen; X is a hydroxy or carboxy protecting group; the broken line between A and R shows that when R and B are hydrogens. and A is a carboxylic acyl. the substituents can be combined to form an azetidinothiazoline bicyclic ring: and the enamine derivatives thereof.
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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
- Granted November 23, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 23, 1999.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.