Process for preparing 2-penem compounds
CA 1180695 A · Owner: Schering Corporation · Inventors: Afonso, Adriano
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 compounds of the formula, (I), wherein n is 0 to 4; R is hydrogen, an alkali metal or quaternary ammonium cation or a metabolisable ester group; R1 and R2 are independently hydrogen or lower alkyl;, R4 is hydrogen, lower alkyl or a group of the formula R5CHOH- with R5 being hydrogen lower alkyl, aryl, aralkyl, heteroaryl or heteroaralkyl; R6 is amino, loweralkylamino, an .alpha.-aminoacid residue bonded through the a-nitrogen atom or the group -OR8 with R8 being hydrogen, lower alkyl allyl, aryl, aralkyl, an alkali metal or quaternary ammonium cation or a metabolisable ester group;, R7 is hydrogen loweralkyl, loweralkoxycarbonyl, aryl, aralkyl …
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 January 8, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 2002.
- 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.