Abstract: The compound 7[2-(aminothiazol-4-yl)-2-methyoxyiminoacetamido]-methylthiomethyl-3-cephe m-4-carboxylic acid or carboxylic ester thereof, or a pharmaceutically acceptable salt thereof is disclosed as an antimicrobial agent.

Abstract: This invention relates to novel compounds of the formula: ##STR1## wherein R.sup.1 is carboxy(lower)alkyl or protected carboxy(lower)alkyl, andR.sup.6 is carboxy or protected carboxy, and a slat, thereof, and processes for preparing the same, useful in the preparation of compounds of high antimicrobial activity.

Abstract: The invention relates to novel intermediates for the preparation of antimicrobial compounds, the intermediate being a compound of the formula: ##STR1## in which R.sup.2 is carboxy or a protected carboxy group,R.sup.8 is 2-hydroxyphenyl andZ is a group of the formula:--CH.dbd.CH.sub.2, --CH.sub.2 --X.sup.2, --CH.sub.2 P.sup.+ (R.sup.7).sub.3.X.sup.3-,--CH.dbd.P(R.sup.7).sub.3 OR--CH.sub.2 OH,wherein X.sup.2 and X.sup.3 are each halogen and R.sup.7 is selected from the group consisting of phenyl, tolyl, xylyl and naphthyl, or a salt thereof.

Abstract: The invention relates to novel cephem compounds, of high antimicrobial activity, of the formula: ##STR1## wherein R.sup.1 and R.sup.9 are amino or acylamino; andR.sup.9 is a group of the formula: ##STR2## where R.sup.2 is organic group,X is CH or N,Z is acid residueY is CH or N and n is O; orY is N.sup..sym. --R.sup.2 wherein R.sup.2 is as defined above and n is 1,or a group of the formula:--A--N.sup..sym. (R.sup.10).sub.3whereinR.sup.10 is lower alkyl andA is lower alkylene.

Abstract: This invention relates to novel compounds of high antimicrobial activity of the formula: ##STR1## wherein R.sup.1 is carboxy(lower)alkyl or protected carboxy(lower)alkyl,R.sup.2 is carboxy or protected carboxy,R.sup.3 is hydrogen or lower alkyl, andR.sup.4 is lower alkyl, lower alkoxy, acyloxymethyl, lower alkylthiomethyl, lower alkoxymethyl, halogen, lower alkenyl or hydrogen,and pharmaceutically acceptable salts thereof,and processes for making the same.

Abstract: The invention relates to cephem compounds of high antimicrobial activity of the formula: ##STR1## wherein R.sup.1 is amino or acylamino,R.sup.2 is lower alkyl, andY is CH or N.

Abstract: The invention relates to novel halovinyl cephem derivatives of high antimicrobial activity of the formula: ##STR1## wherein R.sup.1 is a group of the formula:R.sup.4 --A--CONH--in which R.sup.4 is cyano(lower)alkenylthio or a group of the formula: ##STR2## in which R.sup.6 is hydrogen, amino or a protected amino group, andA is carbonyl, lower alkylene, hydroxy(lower)alkylene or a group of the formula: ##STR3## in which R.sup.5 is hydrogen, carboxy(lower)alkyl or protected carboxy(lower)alkyl;R.sup.2 is carboxy or a protected carboxy group; andX is halogen, and pharmaceutically acceptable salts thereof.

Abstract: The invention relates to cephem compounds of high antimicrobial activity of the formula: ##STR1## wherein R.sup.1 is amino or protected amino,R.sup.2 is lower aliphatic hydrocarbon group,R.sup.3 is a group of the formula: ##STR2## wherein m is 0 and or 1, andn is 1 or 2,which may have a lower alkyl substituent at the N atom, andX is CH or N,and pharmaceutically acceptable salts thereof.

Abstract: The invention relates to novel compounds of high antimicrobial activity of the formula: ##STR1## in which R.sup.1 is amino-substituted-heterocyclic group which may have halogen, protected amino-substituted-heterocyclic group which may have halogen, or a group of the formula: ##STR2## wherein R.sup.3 is lower alkyl,R.sup.2 is carboxy or a protected carboxy group, andA is lower alkylene which may have a substituent selected from the group consisting of amino, a protected amino group, hydroxy, oxo and a group of the formula: .dbd.N.about.OR.sup.4, wherein R.sup.4 is hydrogen, cyclo(lower)alkenyl, lower alkynyl, lower alkenyl, lower alkenyl substituted by carboxy or a protected carboxy group, lower alkyl, or lower alkyl substituted by one or more substituents selected from carboxy, a protected carboxy group, amino, a protected amino group, cyano, phosphono, a protected phosphono group and a heterocyclic group which may have suitable substituents.

Abstract: The invention relates to novel compounds of high antimicrobial activity of the formula: ##STR1## wherein R.sup.1 is amino or acylamino; andR.sup.9 is a group of the formula: ##STR2## wherein R.sup.2 is organic group,X is CH or N,Z is acid residueY is CH or N and n is O; orY is N.sup..sym. --R.sup.2 wherein R.sup.2 is as defined above and n is 1,or a group of the formula:--A--N.sup..sym. (R.sup.10).sub.3whereinR.sup.10 is lower alkyl andA is lower alkylene.

Abstract: The invention relates to novel compounds of high antimicrobial activity of the formula: ##STR1## in which R.sup.1 is amino or a protected amino group, andR.sup.2 is carboxy or a protected carboxy group, and a pharmaceutically acceptable salt thereof.

Abstract: The invention relates to cephem compounds of high antimicrobial activity of the formula: ##STR1## wherein R.sup.1 is amino or acylamino,R.sup.2 is lower alkyl, andY is CH or N.

Abstract: This invention relates to novel compounds of high antimicrobial activity of the formula: ##STR1## wherein R.sup.1 is carboxy(lower)alkyl or protected carboxy(lower)alkyl,R.sup.2 is carboxy or protected carboxy,R.sup.3 is hydrogen or lower alkyl, andR.sup.4 is lower alkyl, lower alkoxy, acyloxymethyl, lower alkylthiomethyl, lower alkoxymethyl, halogen, lower alkenyl or hydrogen,and pharmaceutically acceptable salts thereof.

Abstract: This invention relates to novel cephem compounds, of antimicrobial activity, of the formula: ##STR1## wherein R.sup.1 is carboxy (C.sub.1 -C.sub.6) alkyl or esterified carboxy (C.sub.1 -C.sub.6) alkyl,R.sup.2 is carboxy or an esterified carboxy group, andR.sup.3 is (C.sub.1 -C.sub.6) alkanoylamino, (C.sub.1 -C.sub.6) alkanesulfonyl, triazolylthio, tetrazolylthio having (C.sub.1 -C.sub.6) alkyl, pyridazinylthio having (C.sub.1 -C.sub.6) alkyl, thiadiazolylthio having (C.sub.1 -C.sub.6) alkyl, triazolopyridazinylthio or tetrazolopyridazinylthio, and pharmaceutically acceptable salts thereof.

Abstract: This invention relates to novel 7-acylamino-3-vinylcephalosporanic acid derivatives of high antimicrobial activity, to processes for preparation thereof from novel intermediates, and to said intermediates of the formula: ##STR1## in which R.sub.A is a group of the formula: ##STR2## wherein R.sup.1 is amino-substituted-heterocyclic group which may have halogen, protected amino-substituted-heterocyclic group which may have halogen, or a group of the formula: ##STR3## wherein R.sup.3 is lower alkyl,R.sup.8 is aryl,A is lower alkylene which may have a substituent selected from the group consisting of amino, a protected amino group, hydroxy, oxo and a group of the formula:.dbd.N.about.OR.sup.4,whereinR.sup.

Abstract: The invention relates to novel cephem compounds, of antimicrobial activity, of the formula: ##STR1## wherein R.sup.1 is carboxy (C.sub.1 -C.sub.6) alkyl or esterified carboxy (C.sub.1 -C.sub.6) alkyl, R.sup.2 is carboxy or esterified carboxy, and R.sup.3 is (C.sub.1 -C.sub.6) alkanoyloxy (C.sub.1 -C.sub.6) alkyl, tetrazolopyridazinylthio (C.sub.1 -C.sub.6) alkyl, tetrazolothio (C.sub.1 -C.sub.6) alkyl, or (C.sub.1 -C.sub.6) alkyl tetrazolothio (C.sub.1 -C.sub.6) alkyl, and pharmaceutically acceptable salts thereof.

Abstract: Anti-microbial cephalosporins of the formula ##STR1## in which R.sup.2 is methoxymethyl or methylthiomethyl, and R.sup.6 is carboxy (lower) alkyl have been prepared.

Abstract: This invention relates to novel cephem compounds of high antimicrobial activity of the formula: ##STR1## wherein R.sup.1 is amino substituted thiazolyl selected from the group consisting of 2-aminothiazol-4-yl, 2-aminothiazol-5-yl, 4-aminothiazol-2-yl, 2-amino-5-halothiazol-4-yl, 2-amino-4-halothiazol-5-yl, and 4-amino-5-halothiazol-2-yl,protected amino substituted thiazolyl selected from said group,lower alkylamino substituted thiazolyl,amino substituted thiadiazolyl,protected amino substituted thiadiazolyl,amino substituted pyridyl,protected amino substituted pyridyl,furyl,thiazolyl,thiadiazolyl,phenyl, ornaphthyl,R.sup.2 is carboxy(lower)alkyl or protected carboxy(lower)alkyl,R.sup.3 is lower alkylthio, andR.sup.4 is carboxy or protected carboxy, and pharmaceutically acceptable salts thereof.

Abstract: The invention relates to novel 7-acylamino-3-vinylcephalosporanic acid derivatives of antimicrobial activity, and to methods of preparation thereof from novel intermediate compounds of the formula: ##STR1## in which R.sub.C is amino or a group of the formula: ##STR2## wherein R.sup.8 is aryl,A.sup.12 is lower alkylene having a group of the formula: .dbd.N.about.OR.sup.4, wherein R.sup.4 is hydrogen, cyclo(lower) alkenyl, lower alkynyl, lower alkenyl, lower alkenyl substituted by carboxy or a protected carboxy group, lower alkyl, or lower alkyl substituted by one or more substituent(s) selected from carboxy, a protected carboxy group, amino, a protected amino group, cyano, phosphono, a protected phosphono group and a heterocyclic group which may have suitable substituent(s),R.sup.a is a protected amino group,R.sup.b is a protected carboxy group,R.sup.c and R.sup.d are combined to form oxo or a protected oxo group, and X.sup.1 is halogen, andR.sup.

Abstract: This invention relates to novel 7-acylamino-3-vinyl-cephalosporanic acid derivatives and pharmaceutically acceptable salts thereof, of high antimicrobial activity.