Process for preparing 3-acyloxymethyl-2-cephem compounds
CA 1073899 A · Owner: Eli Lilly And Company · Inventors: Chou, Ta-Sen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a novel process whereby a 3-exomethylenecepham sulfoxide ester is reacted with a mixture of a C1-C4 acyl chloride and a corresponding C1-C4 acid anhydride at a temperature of from about 70°C. to about 130°C. to produce the corresponding 3-acyloxymethyl- .DELTA.2-cephem, which is useful as an intermediate in the preparation of antibiotically active cephalosporins.
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
- Granted March 18, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 18, 1997.
- 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.