Abstract:
Fluorescent substrates for beta-lactamases having the general formula shown above are provided. Z includes a fluorophore or chromophore and includes a group that may link to the lactam-containing group; R1 and R2 are independently selected from H, aliphatic, aromatic, alkyl, and acyl; R4 may be H and lower alkyl; B may be H, physiologically acceptable salts or metal, ester groups, ammonium cations, —CHR5OCO(CH2)nCH3, —CHR5OCOC(CH3)3, acylthiomethyl, acyloxy-alpha-benz, deltabutyrolactonyl, methoxycarbonyloxymethyl, phenyl, methylsulphinylmethyl, beta-morpholinoethyl, dialkylaminoethyl, and dialkylaminocarbonyloxymethyl, in which R5 is selected from the group consisting of H and lower alkyl; n is an integer between 0 and 10, inclusive; and A may be S, O, SO, SO2 or CH2. In embodiments, the beta-lactam ring may be cleaved by a beta-lactamase enzyme effective to free a fluorophore. Methods of assaying beta-lactamase activity and monitoring expression in systems using beta-lactamase as a reporter gene are also disclosed.
Abstract:
Carbacephalosporin compounds of formula (I), ##STR1## salts thereof, processes for their synthesis and uses thereof, wherein: R.sup.1 is hydrogen, methoxy or formamido; R.sup.2 is an acyl group; CO.sub.2 R.sup.3 is a carboxy group or a carboxylate anion, or R.sup.3 is a carboxy protecting group or a pharmaceutically acceptable salt-forming group or in vivo hydrolysable ester group; R.sup.4, R.sup.5, R.sup.6 and R.sup.7 represent hydrogen or a substituent; R.sup.4 and R.sup.7 may be replaced by a chemical bond between the two carbon atoms shown; R.sup.5 and R.sup.6 may be linked together into a cyclic system. The compounds (I) have antibacterial properties.
Abstract:
Novel antibiotics of the formula: ##STR1## and its salts, esters and amides wherein R is acyl;B is H, OMe, Me or SR wherein R is lower alkyl or aryl;A.sup.1 is hydrogen, hydroxy, or an organic group; and,X is a divalent radical selected from --O--, --CH.sub.2 --, or --NY-- where Y is hydrogen or lower alkyl of from 1 to 6 carbon atoms such as methyl, ethyl, i-propyl, n-butyl, n-pentyl, n-hexyl and the like, formyl or benzyl.This invention is directed to novel antibiotics, novel intermediates useful in their preparation, and processes for preparing the novel antibiotics. The novel antibiotics are effective against gram-negative bacteria including Proteus vulgaris, E. coli and Salmonella schottmulleri, and gram-positive bacteria including Staphylococcus aureas and Bacillus subtilis and are useful in combatting bacterial infections in animals or humans in addition to various industrial applications.
Abstract:
Fluorescent substrates for beta-lactamases having the general formula shown above are provided. Z includes a fluorophore or chromophore and includes a group that may link to the lactam-containing group; R1 and R2 are independently selected from H, aliphatic, aromatic, alkyl, and acyl; R4 may be H and lower alkyl; B may be H, physiologically acceptable salts or metal, ester groups, ammonium cations, —CHR5OCO(CH2)nCH3, —CHR5OCOC(CH3)3, acylthiomethyl, acyloxy-alpha-benz, deltabutyrolactonyl, methoxycarbonyloxymethyl, phenyl, methylsulphinylmethyl, beta-morpholinoethyl, dialkylaminoethyl, and dialkylaminocarbonyloxymethyl, in which R5 is selected from the group consisting of H and lower alkyl; n is an integer between 0 and 10, inclusive; and A may be S, O, SO, SO2 or CH2. In embodiments, the beta-lactam ring may be cleaved by a beta-lactamase enzyme effective to free a fluorophore. Methods of assaying beta-lactamase activity and monitoring expression in systems using beta-lactamase as a reporter gene are also disclosed.
Abstract:
Antimicrobial lactam-quinolone compounds comprising a lactam-containing moiety linked to a quinolone moiety, of the formula: ##STR1## wherein (1) A.sup.1, A.sup.2, A.sup.3, R.sup.1, R.sup.4 and R.sup.6 generally form any of a variety of quinolone, naphthyridine or related cyclic moieties known in the art to have antimicrobial activity; and(2) R.sup.1 or R.sup.3 contain a linking moiety, linking the quinolone moiety to a lactam-containing moiety having the formula: ##STR2## wherein (3) R.sup.10, R.sup.11, R.sup.12, R.sup.13, and R.sup.14, together with bonds "a" and "b", form any of a variety of lactam-containing moieties known in the art to have antimicrobial activity; and(4) the linking moiety includes (for example) carbamate, dithiocarbamate, urea, thiourea, isouronium, isothiouronium, guanidine, carbonate, trithiocarbonate, reversed carbamate, xanthate, reversed isouronium, reversed dithiocarbamate, reversed isothiouronium, amine, imine, ammonium, heteroarylium, ether, thioether, phosphono, phosphoramide, phosphate, sulfonamide, ester, thioester, amide, and hydrazide groups.
Abstract:
Compounds of structure: ##STR1## as well as their pharmaceutically-acceptable salts and biohydrolyzables esters, and hydrates thereof, are effective antiinfective agents, useful in treating and preventing infection.
Abstract:
The invention provides compounds of the formula ##STR1## wherein X is CH.sub.2, S or O; R.sub.1 is a 3 position substituent such as hydrogen, hydroxy, halo, trifluoromethyl, C.sub.2 F.sub.5, C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 substituted alkyl, C.sub.1 -C.sub.6 alkenyl, C.sub.1 -C.sub.6 alkynyl, CH.sub.2 O(CO)R', CH.sub.2 O(CO)NH.sub.2, CO.sub.2 R', thio(C.sub.1 -C.sub.6)alkyl, thio(C.sub.1 C.sub.6)alkenyl, oxo(C.sub.1 -C.sub.6)alkyl, phosphine oxide, quaternary ammonium group, substituted or unsubstituted thiazolothio, or oxo(C.sub.1 -C.sub.6)alkenyl;wherein R' is hydrogen, C.sub.1 -C.sub.6 alkyl, or C.sub.1 -C.sub.6 alkenyl;R.sub.2 is hydrogen or a carboxy protecting group;R.sub.3 is ##STR2## (CH.sub.2).sub.n ; wherein R.sub.6 is hydrogen Me, CH.sub.2 F, CF.sub.3, C.sub.2 H.sub.5, CH.sub.2 CH.sub.2 F, CH.sub.2 CF.sub.3, C.sub.2 F.sub.5, CH.sub.2 CO.sub.2 R', CH.sub.2 CONH.sub.2, C(Me).sub.2 CO.sub.2 R', or C(Me).sub.2 CONH.sub.2 ; and n is 0-5;R.sub.4 is ##STR3## wherein Z is O, S, NH, or CH.sub.2 ; Y is CH or N; and R.sub.7 is hydrogen, C.sub.1 -C.sub.6 alkyl, CONH.sub.2, or CO.sub.2 R'; andR.sub.5 is ##STR4## wherein R.sub.8 is CH, N, COH, CO(C.sub.1 -C.sub.6 alkyl) CSH, or CNH.sub.2 ; and R.sub.9 is R.sub.8 as defined; said R.sub.5 optionally substituted 1-4 times with halo, OH, SH, NH.sub.2, NO.sub.2, CH.sub.3, C.sub.2 H.sub.5, CO.sub.2 R', CONH.sub.2, SO.sub.3 H, or SO.sub.2 NHR'; and salts thereof. Also, pharmaceutical formulations and methods for treating bacterial infections in man or other animals using the above compounds are disclosed.
Abstract:
1-Carba(1-dethia)cephem antibacterial agents possessing a 3-(substituted or unsubstituted)thiazolo group are provided. Further provided is a method for treating bacterial infections in man and other animals and a pharmaceutical formulation utilizing said 1-carba(1-dethia)cephems.
Abstract:
This invention provides a method of producing a .beta.-lactam derivative represented by the formula (I): ##STR1## said method consisting essentially of the step of reacting a .beta.-lactam derivative represented by the formula (II): ##STR2## with a phenol in a reaction system which consists essentially of said .beta.-lactam derivative of formula (II) and said phenol.
Abstract:
The present invention includes (7R)-7-(acylamino)-3-(substituted-pyridinyl)-3-cephem-4-carboxylic acids or their pharmacologically acceptable salts which exhibit antibiotic activity against methicillin-resistant bacteria and are therefore useful as antibacterial agents.