Process for 3beta-aminoazetiden-2-ones
CA 1105471 A · Owner: Eli Lilly And Company · Inventors: Mcshane, Lawrence J.; Koppel, Gary A.; Cooper, Robin D.G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a novel process fox preparing novel 7-oxo-3-phenyl-.alpha.-4-(benzyloxy)phenyl-4-oxa- 2,6-diazabicyclo3.2.0hept-2-ene-6-acetic acid esters of the formula, I, wherein R is C1-C3 alkyl, phenyl or benzyl; R1 is methyl, benzyl, 4-methoxybenzyl, or diphenylmethyl; and, R2 is benzyl, 4-methoxybenzyl or diphenylmethyl;, which comprises reacting in an inert solvent a 3-acylamino- 4.alpha.-acetoxyazetidinone ester of the formula III, wherein R, R1, and R2 have the above-defined meanings with, hydrogen chloride. The novel compounds are useful intermediates in the preparation of the antibiotic FR 1923 (nocardicin).
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 July 21, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 21, 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.