The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 01, 1984
Filed:
Jun. 03, 1981
Kong Luk, Horley, GB;
Beecham Group Limited of Beecham House, Brentford, GB;
Abstract
The present invention provides a process for the preparation of a fused bicyclic .beta.-lactam containing compound having an optionally salified free carboxylic acid group which process comprises the reaction of an ester of the formula (I): ##STR1## with halide ion; wherein R is the residue of the fused bicyclic .beta.-lactam containing compound, R.sup.1 is an alkyl group of 1-6 carbon atoms optionally substituted by an alkoxy group of 1-4 carbon atoms or is an optionally substituted phenyl group or an alkyl group of 1-4 carbon atoms substituted by an optionally substituted phenyl group; and R.sup.2 is a hydrogen atom or an alkyl group of 1-4 carbon atoms or is joined to R.sup.2 to form part of a 5- or 6- membered carbocyclic or heterocyclic ring.