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:
Dec. 29, 1981
Filed:
Sep. 14, 1979
David Hartley, Ware, GB;
Alexander W Oxford, Royston, GB;
Roger Dansey, Welwyn, GB;
Frank Ellis, Luton, GB;
Glaxo Group Limited, London, GB;
Abstract
Compounds of the formula (I) ##STR1## (in which X represents HS-- or a group R.sub.1 R.sub.2 N-- wherein R.sub.1 and R.sub.2 which may be the same or different represent hydrogen or a straight or branched chain alkyl group containing from 1 to 4 carbon atoms or a benzyl group and R.sub.3 represents a C.sub.3-7 alkyl group or a C.sub.3-7 cycloalkyl group) are prepared by reacting an .alpha.-ketoester of the formula (II) ##STR2## (in which Alk represents an alkyl group) or a precursor thereof with a compound of the formula (III) ##STR3## The precursor of the compound of formula (II) may be a mixture of isomeric enol esters ##STR4## The compounds of formula (I) may be converted into compounds of formula VIII ##STR5## in which R.sub.1 and R.sub.2 which may be the same or different represent hydrogen or a straight or branched chain alkyl group containing from 1 to 4 carbon atoms, and R.sub.3 is as defined above.