Method for producing cephem compounds
CA 1102791 A · Owner: Takeda Chemical Industries, Ltd. · Inventors: Tsushima, Susumu; Nishimura, Tatsuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
of disclosure, Cephem compounds of the formula: , wherein R2 is hydrogen or an ester residue or salts thereof, are produced in low production cost and excellent yields by a method comprising silylating a compound of the formula: , wherein R1CO is an acyl group and R2 has the same meaning as defined above, halogenating the silylated compound reacting, the iminohalide with a lower alcohol and subjecting the resultant iminoether compound to solvolysis.
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 June 9, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 9, 1998.
- 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.