Patents by Inventor David F. Corbett
David F. Corbett has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 4477662Abstract: A process for the preparation of an antibacterially active compound of the formula (I): ##STR1## and salts and esters thereof wherein R.sup.1 and R.sup.2 independently are hydrogen or an organic group, and R.sup.3 is an organic group bonded via a carbon atom to the sulphur atom, which comprises reacting a compound of the formula (II): ##STR2## wherein R.sup.4 is an organic group different to R.sup.3 and R.sup.a is hydrogen or a carboxy-blocking group, with a thiol R.sup.3 SH or reactive derivative thereof. In addition certain compounds within the formula (II) are novel and useful antibacterial agents in their own right.Type: GrantFiled: February 3, 1982Date of Patent: October 16, 1984Assignee: Beecham Group p.l.c.Inventors: David F. Corbett, Pamela Brown nee Davis, Roger J. Ponsford
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Patent number: 4473578Abstract: The compounds of the formula: ##STR1## and pharmaceutically acceptable salts and in-vivo hydrolysable esters thereof wherein R.sup.1 is a hydrogen atom or a group selected from OH, OSO.sub.3 H or a pharmaceutically acceptable salt or C.sub.1-4 alkyl ester thereof, OR.sup.2, SR.sup.3, OCOR.sup.2, OCO.sub.2 R.sup.3 or OCONHR.sup.3, where R.sup.2 is a C.sub.1-6 alkyl group or an optionally substituted benzyl group and R.sup.3 is a C.sub.1-6 alkyl group or an optionally substituted benzyl or an optionally substituted phenyl group; and R.sup.22 is a hydrogen atom, C.sub.1-6 alkyl, C.sub.2-6 alkenyl, C.sub.3-6 alkynyl wherein the triple bond is not present on the carbon adjacent to the sulphur atom, aralkyl, C.sub.1-6 alkanoyl, aralkanoyl, aryloxyalkanoyl or arylcarbonyl, any of such R.sup.22 groups being optionally substituted; with the proviso that when R.sup.22 is 2-aminoethyl R.sup.1 must be SR.sup.3 or OSO.sub.3 H or a pharmaceutically acceptable salt of C.sub.Type: GrantFiled: July 29, 1982Date of Patent: September 25, 1984Assignee: Beecham Group LimitedInventor: David F. Corbett
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Patent number: 4438036Abstract: The present invention provides a process for inversion of the absolute stereochemistry at the .alpha.-carbon atom of a C-6 substituent of a bicyclic carbapenem antibiotic via a phosphorus - azodicarboxylate mediated reaction. Novel azides, amines and formates are described as useful intermediates and as antibacterial agents.Type: GrantFiled: October 13, 1981Date of Patent: March 20, 1984Assignee: Beecham Group LimitedInventors: David F. Corbett, Robert Southgate, Steven Coulton
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Patent number: 4387051Abstract: The present invention provides the compounds of the formula (II): ##STR1## and pharmaceutically acceptable salts and esters thereof wherein R.sup.3 is a hydrogen atom, a group HO.sub.3 S-- or a group R.sup.5 CO wherein R.sup.5 is C.sub.1-6 alkyl, C.sub.2-6 alkenyl, aryl, aryl(C.sub.1-6)alkyl or aryloxy(C.sub.1-6)alkyl; and R.sup.4 is an organic group other than methyl bonded to the --CO--NH-- moiety via a carbon atom; with the proviso that when R.sup.3 is a hydrogen atom or a group R.sup.5 CO the stereochemical configuration at the .alpha.-carbon atom of the C-6 substituent is S, and with the further proviso that when R.sup.3 is a group HO.sub.3 S-- the hydrogen atoms at C-5 and C-6 are cis. Their use is described as are processes for their preparation. Compounds wherein the R.sup.4 CO-- moiety is replaced by a hydrogen atom are also prepared.Type: GrantFiled: October 28, 1980Date of Patent: June 7, 1983Assignee: Beecham Group LimitedInventors: David F. Corbett, Robert Southgate, Alfred J. Eglington
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Patent number: 4386029Abstract: The present invention provides a process for the preparation of a compound of the formula (O): ##STR1## wherein R.degree. is SCH.sub.2 CH.sub.2 NH.sub.2 which process comprises the reaction of a cleavable ester of a compound of the formula (O) wherein R.degree. is H with an optionally protected compound XCH.sub.2 CH.sub.2 NH.sub.2 wherein X is a displaceable group.Type: GrantFiled: October 24, 1980Date of Patent: May 31, 1983Assignee: Beecham Group LimitedInventor: David F. Corbett
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Patent number: 4374144Abstract: The present invention relates to the preparation of compounds of the formula: ##STR1## wherein CO.sub.2 R.sub.1 is a free, salted or esterified carboxyl group, n is 0 or 1, and R.sub.2 is hydrogen or an acyl group or a group of the sub-formula (a):R.sub.3 O.sub.3 S (a)wherein R.sub.3 is a salting ion or a methyl or ethyl group, with the proviso that when R.sub.2 is a group of the formula (a), the compound has cis stereochemistry about the .alpha.-lactam ring; which have been found to possess antibacterial and .alpha.-lactamase inhibitory activity.Type: GrantFiled: November 3, 1980Date of Patent: February 15, 1983Assignee: Beecham Group LimitedInventor: David F. Corbett
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Patent number: 4366167Abstract: This invention provides the anti-bacterial compounds (III) and (IV): ##STR1## and salts and esters thereof wherein X is a --CH.sub.2 --CH.sub.2 -- or trans --CH.dbd.CH-- group and R is a group R.sup.1 or NH.R.sup.1 wherein R.sup.1 is an alkyl group of up to 6 carbon atoms, an alkenyl group of up to 6 carbon atoms, an aryl group, or an alkyl group of up to 6 carbon atoms substituted by an aryl or aryloxy group.The invention also provides processes for their preparation comprising a the acylation or carbamoylation of the corresponding 6-(1-hydroxyethyl) compounds.The invention further provides pharmaceutical compositions containing them.Type: GrantFiled: March 30, 1979Date of Patent: December 28, 1982Assignee: Beecham Group LimitedInventor: David F. Corbett
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Patent number: 4278686Abstract: The present invention provides antibiotic compounds of the formula: ##STR1## and salts and cleavable esters thereof wherein X is a SCH.sub.2 CH.sub.2 NH.sub.2 or YNH-COCH.sub.3 group where Y is a SCH.sub.2 CH.sub.2, trans --SO--CH.dbd.-- or cis or trans --S--CH.dbd.CH-- group and R is a lower alkyl, aryl, aralkyl, lower alkenyl, or substituted lower alkyl.Type: GrantFiled: April 27, 1979Date of Patent: July 14, 1981Assignee: Beecham Group LimitedInventors: David F. Corbett, Alfred J. Eglington
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Patent number: 4210662Abstract: Compounds of the formula ##STR1## and salts thereof are useful both for their antibacterial activity and as synergists in combination with penicillins and cephalosporins.Type: GrantFiled: May 25, 1977Date of Patent: July 1, 1980Assignee: Beecham Group LimitedInventors: Alfred J. Eglington, Thomas T. Howarth, David F. Corbett
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Patent number: 4138403Abstract: Compounds of the formula ##STR1## and salts and esters thereof wherein R.sub.1 is hydrogen, alkyl of 1 to 4 carbon atoms, phenyl, alkenyl of 2 to 4 carbon atoms, alkynyl of 2 to 4 carbon atoms, acyl of 1 to 4 carbon atoms, a carboxylic acid group or ester thereof of 1 to 7 carbon atoms, or alkyl of 1 to 4 carbon atoms substituted by 1 or 2 halogen atoms, hydroxyl, substituted hydroxyl, amino, protected amino, substituted thio of 1 to 7 carbon atoms, substituted sulphinyl of 1 to 7 carbon atoms, substituted sulphonyl of 1 to 7 carbon atoms, or by a carboxylic acid group or ester thereof of 1 to 7 carbon atoms;R.sub.2 is hydrogen or alkyl of 1 to 4 carbon atoms, or is joined to R.sub.1 to form a cycloalkyl group of 3 to 6 carbon atoms;R.sub.3 is hydrogen, chlorine or bromine; andR.sub.4 is hydrogen, halogen, azido or amino; provided that when R.sub.4 is azido, R.sub.3 is hydrogen and R.sub.1 is methyl,R.sub.2 is not methyl, and that when R.sub.2 R.sub.3 and R.sub.4 are hydrogen andR.sub.Type: GrantFiled: July 26, 1976Date of Patent: February 6, 1979Assignee: Beecham Group LimitedInventors: Thomas T. Howarth, Allan G. Brown, David F. Corbett, Roger J. Ponsford
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Patent number: 4132712Abstract: Compounds of the formula ##STR1## wherein CO.sub.2 R is an ester group, are useful for their .beta.-lactamase inhibitory activity.Type: GrantFiled: August 26, 1976Date of Patent: January 2, 1979Assignee: Beecham Group LimitedInventors: Thomas T. Howarth, Irene Stirling, David F. Corbett