Process and intermediates for preparation of 1,1- dioxopenicillan-oyloxymethyl 6-beta- aminopenicillanate
CA 1204736 A · Owner: Pfizer Limited · Inventors: Weeks, Paul D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PROCESS AND INTERMEDIATES FOR, PREPARATION OF 1,1-DIOXOPENICILLAN- OYLOXYMETHYL 6-BETA-AMINOPENICILLANATE Abstract, A process for the preparation of 1,1-dioxopenicillanoyloxymethyl 6-beta-aminopenicillanate which comprises reacting 1,1-dioxopenicillanoyloxymethyl 6-phenylacetamidopenicillanate or the corresponding phenoxyacetamidopenicillanate under anhydrous conditions with a halogenating agent in the presence of a reaction inert solvent to form an intermediate imino halide addition of a primary alcohol having from one to four carbon atoms to convert the imino halide to an imino ether and subsequent hydrolysis to give the desired product.
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 May 20, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 20, 2003.
- 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.