Abstract: This invention relates to new cephem compounds of antimicrobial activity, of the formula: ##STR1## wherein R.sup.1 is amino or a protected amino group;R.sup.2 is hydrogen, lower aliphatic hydrocarbon group which may be substituted with suitable substituent(s), cyclo(lower)alkyl or cyclo(lower)alkenyl; andR.sup.3 is thiazolio group which may be substituted with suitable substituent(s) or a pyridinio group substituted with substituent(s) selected from the group consisting of halogen, cyano, hydroxy, amino, acylamino, lower alkanoyl, hydroxycarbamoyl, alkylcarbamoyl, carboxy, protected carboxy, lower alkyl, hydroxy(lower)alkyl, sulfo(lower)alkyl, protected amino(lower)alkyl, amino(lower)alkyl, carboxy(lower)alkyl and hydroxyimino(lower)alkyl; and pharmaceutically acceptable salts thereof.

Abstract: This invention relates to new cephem and cepham compounds of high antimicrobial activity of the formula: ##STR1## wherein R.sup.1 is amino or a protected amino,R.sup.2 is hydrogen, acyl, aryl which may be substituted with suitable substituent(s), lower alkyl substituted with suitable substituent(s), lower alkenyl, lower alkynyl, cycloalkyl which may be substituted with suitable substituent(s), cyclo(lower)alkenyl, or S or O containing 5-membered heterocyclic group substituted with oxo group(s),R.sup.3 is hydrogen or lower alkyl,R.sup.4 is hydrogen, acyloxy(lower)alkyl; acylthio(lower) alkyl; pyridinium(lower)alkyl which may be substituted with suitable substituent(s); a heterocyclicthio(lower)alkyl which may be substituted with suitable substituent(s); lower alkyl;l halogen; hydroxy; thiazolium(lower)alkyl which may be substituted with suitable substituent(s); or lower alkoxy; R.sup.5 is carboxy or a protected carboxy, wherein R.sup.5 is COO.sup.- when R.sup.

Abstract: This invention relates to novel compounds having antimicrobial activity of the formula ##STR1## in which R.sup.1 is amino or a protected amino group,R.sup.2 is cyclo(lower)alkyl, cyclo(lower)alkenyl, lower alkyl, lower alkynyl, carboxy(lower)alkyl, protected carboxy(lower)alkyl or lower alkylthio(lower)alkyl, andY is hydrogen, amino or a protected amino group, and pharmaceutically acceptable salts thereof.

Abstract: This invention relates to novel cephem compounds, useful as intermediates in the formation of novel 7-aminothiadiazol alkoxyimino acetamido cephem compounds of high antimicrobial activity, said novel intermediates being 7-aminothiadiazol alkoxyimino acetamido cephem derivatives with substitution in the 3-position of the cephem nucleus of lower alkanoyl (lower) alkanoyloxy grouping.

Abstract: This invention relates to novel 7-pyrimidinyl and pyridinyl acetamido cephem derivatives of high antibacterial activity.

Abstract: This invention relates to novel 7-thiadiazol-oxyimino-3-cephem and cepham 4-carboxylic acid compounds of high antimicrobial activity.

Abstract: This invention relates to new cephem and cepham compounds of high antimicrobial activity, and more particularly to new 7-amino-thiadiazole oxyimino derivatives of cephem and cepham compounds.

Abstract: The present invention relates to new cephem compounds, more particularly to new 7-alkoxyimino amino-substituted thiadiazolylacetamido 3-(1-pyridiniomethyl)-3-cephem-4-carboxylate compounds, of high antimicrobial activity, and to pharmaceutically acceptable salts thereof.

Abstract: 7-Substituted-3-cephem and cepham-4-carboxylic acids of formula (I) ##STR1## wherein R.sup.1 is amino or a protected amino, R.sup.2 is hydrogen, acyl, aryl which may be substituted with suitable substituent(s), lower alkyl substituted with suitable substituent(s), lower alkenyl, lower alkynyl, cycloalkyl which may be substituted with suitable substituent(s), cyclo(lower)alkenyl, or S- or O-containing 5-membered heterocyclic group substituted with oxo group(s).R.sup.3 is hydrogen or lower alkyl,R.sup.4 is hydrogen; acyloxy(lower)alkyl; acylthio(lower)alkyl pyridinium(lower)alkyl which may be substituted with suitable substituent(s); a heterocyclicthio(lower)alkyl which may be substituted with suitable substituent(s); lower alkyl; halogen; or hydroxy; andR.sup.5 is carboxy or a protected carboxy wherein R.sup.5 is COO-- when R.sup.4 is pyridinium(lower)alkyl which may be substituted with suitable substituent(s), and the heavy solid line means single or double bond, have useful antibiotic properties.

Abstract: This invention relates to novel cephem compounds of high antimicrobial activity and more particularly to 7-aminothiadiazole alkoxyimino acetamido cephem derivatives with substitution in the 3-position of the cephem nucleus of carbamoyl-pyridiniomethyl grouping or methyl-oxo-hydroxy-dihydrotriazinyl thiomethyl grouping.

Abstract: 7-Substituted-3-cephem and cepham-4-carboxylic acids represented by the following formula (I): ##STR1## wherein R.sup.1 is amino or a protected amino,R.sup.2 is hydrogen, acyl, aryl which may be substituted with suitable substituent(s), lower alkyl substituted with suitable substituent(s), lower alkenyl, lower alkynyl, cycloalkyl which may be substituted with suitable substituent(s), cyclo(lower)alkenyl, or S or O containing 5-membered heterocyclic group substituted with oxo group(s),R.sup.3 is hydrogen or lower alkyl,R.sup.4 is hydrogen; acyloxy(lower)alkyl); acylthio(lower)alkyl; pyridinium(lower)alkyl which may be substituted with suitable substituent(s); a heterocyclicthio(lower)alkyl which may be substituted with suitable substituent(s); lower alkyl; halogen; or hydroxy; and,R.sup.5 is carboxy or a protected carboxy, wherein R.sup.5 is COO.sup.- when R.sup.

Abstract: Antibiotic cephalosporin compounds, method of making and pharmaceutical composition thereof represented by the general formula ##STR1## wherein R.sup.1 is amino, lower alkylamino, a protected amino, a protected lower alkylamino, hydroxy or lower alkoxy,R.sup.2 is hydrogen, acyloxy, pyridium or a heterocyclicthio group which may have suitable substituent(s),R.sup.3 is carboxy or its derivative,A is carbonyl, hydroxy(lower)alkylene or a protected hydroxy(lower)alkylene andR.sup.4 is hydrogen or halogen, orR.sup.2 and R.sup.3 are linked together to represent a group of the formula --COO--.

Abstract: This invention relates to new 7-substituted-3-cephem-4-carboxylic acids and pharmaceutically acceptable salts thereof, which have antimicrobial activities, and processes for preparation thereof, to intermediates for preparing the same and processes for preparation thereof, and to pharmeceutical compositions comprising the same and methods of using the same prophylactically and therapeutically for treatment of infectious diseases in human beings and animals.

Abstract: The invention relates to novel amino or acylamino-substituted pyrimidinyl cephalosporanic acid derivatives and pharmaceutically acceptable salts thereof, of antibacterial activity, to processes for the preparation thereof, and to pharmaceutical compositions comprising the novel cephalosporanic acid derivatives.