Intermediates useful for the preparation of penems
CA 1340579 C · Owner: Pfizer Limited · Inventors: O'Neil, Brian Thomas; Phillips, Douglas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a compound of the formula: wherein R is -CH2CX=CH2, -CH2CH2S1(CH3)3 p-nitrobenzyl, or a conventional radical forming an ester which is hydrolyzed under physiological conditions;, X is H or C1; R1 is a conventional silyl protecting group; and Z, X1 and X2 are taken together and are ; or, Z, X1 and X2 are taken separately X1 and X2 are each, hydrogen, and Z is p-nitrophenyloxycarbonyl. The compound is useful for the synthesis of certain 6-(1-hydroxyethyl) 2-substituted penem antibiotics.
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 1, 1999. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 1, 2016.
- 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.