摘要:
Cephalosporin compounds having 2-(2-aminothiazol-4-yl)-2{(1S)-carboxyethoxyimino}acetyl group on the side chain at the 7-position thereof and 1-ethylpyridinium-4-ylthiomethyl group on the side chain at the 3-position thereof or non-toxic salts thereof are excellent antibacterial agents for mammals including human. The cephalosporin derivatives have low toxicity.
摘要:
New cephalosporin derivatives of a general formula (I) and non-toxic salts and non-toxic esters thereof are provided: ##STR1## (wherein R represents an acyclic or cyclic lower alkyl group having 1-6 carbon atoms, which may optionally be substituted by a halogen atom; the steric configuration as asterisked (*) includes an optical-active (R)-form or (S)-form or an optical-inactive (RS)-form; n is 0 or 1, n.sup.1 is 0 to 3, n.sup.2 is 0 to 3; and when n.sup.1 is 0, n.sup.2 is 3; when n.sup.1 is 1, n.sup.2 is 2; when n.sup.1 is 2, n.sup.2 is 1; when n.sup.1 is 3, n.sup.2 is 0).The new derivatives of the formula (I) and non-toxic salts and esters thereof have high bactericidal activity with broad antibacterial spectra, and these are useful as active ingredients in bactericides.
摘要:
This is a class of antibacterial compounds of the formula: ##STR1## wherein Y is straight or branched alkyl or alkenyl chain, cycloalkanomethyl of 3-6 carbon atoms, each group being optionally substituted by halogen, or a group ##STR2## wherein n is 0 or an integer of 1-3, A is a group --COR.sup.3 wherein R.sup.3 is hydroxy, a group ##STR3## wherein R.sup.4 and R.sup.5, which may be the same or different, are hydrogen or alkyl of 1-5 carbon atoms, a group ##STR4## or a 5- or 6-membered heterocyclic group containing nitrogen and/or sulfur, and R.sup.1 and R.sup.2, which may be the same or different, are hydrogen, alkyl of 1-5 carbon atoms, or R.sup.1 and R.sup.2 may be combined together to form cycloalkylidene of 3-5 carbon atoms, and Z is a group of the formula: ##STR5## wherein m is 0 or an integer of 3-5, R.sup.6 is hydrogen or alkyl of 1-3 carbon atoms, and R.sup.7, when m is an integer of 3-5, is alkyl of 1-5 carbon atoms, alkenyl, cyclopropyl, a group --(CH.sub.2).sub.p B wherein p is 0 or an integer of 1-3 and B is amino, alkyl-substituted amino, hydroxy, carboxy, carbamoyl, trifluoromethyl, sulfonic acid, sulfonic acid amide, alkylthio or cyano or, when m is 0, is alkyl of 1-5 carbon atoms, which may optionally be substituted by halogen, alkenyl, a group ##STR6## wherein R.sup.8 is hydrogen, alkyl of 1-4 carbon atoms or phenyl, or cyclopropyl, and a salt thereof.
摘要:
Disclosed is a process for preparing antibiotic 1-oxadethiacephalosporins via diazo-species I: ##STR1## wherein: A is acyl; R.sup.1 is H or OCH.sub.3 ; and R.sup.2 is a protecting group.
摘要:
The crystalline dihydrochloride of a specific cephalosporin derivative is stable to heat and retains its antibacterial activity even after storage over long periods at high temperature. The crystalline dihydrochloride can be obtained by removing protective groups from the cephalosporin derivative wherein the amino group and carboxy groups are protected and then crystallizing the cephalosporin derivative from a hydrochloric acid aqueous solution. The crystalline dihydrochloride is useful for pharmaceutical preparations.
摘要:
Disclosed is a process for preparing antibiotic 1-oxadethiacephalosporins via diazo-species I: ##STR1## wherein: A is acyl; R.sup.1 is H or OCH.sub.3 ; and R.sup.2 is a protecting group.
摘要:
An ester of 7-acylamido-3-acylthio-3- or -2-cephem-4-carboxylic acid represented by general formula (1) ##STR1## wherein R.sup.1 is an acyl group, R.sup.2 is a carboxyl-protecting group, R.sup.3 is a lower alkyl group, an aryl group or a substituted aryl group, or a mixture of two or more of said ester is used as the starting compound and is reacted wit a tertiary amine and also a secondary amine. Then the tertiary amine salt compound as formed as the reaction product is reacted with a compound of formula (4)R.sup.4 --X (4)wherein R.sup.4 is a lower alkyl group, a cycloalkyl group or a heterocyclic group or a heterocyclic group-substituted methyl group and X is a leaving group, whereby the desired ester of 7-acylamido-3-substituted thio-3-cephem-4-carboxylic acid of formula (5) ##STR2## can be produced preferentially, conveniently and efficiently.
摘要:
The invention relates to derivatives of pyrrolidin-2-ylcarbonylheterocyclic compound of the general formula ##STR1## in which R.sup.1 represents C.sub.1-6 alkyl, C.sub.1-20 cycloalkyl, aryl or heteroaryl,R.sup.2 represents a heterocyclic compound selected from the group consisting of 2-thiazole, 2-oxazole, 2-imidazole, 2-pyrrole, 2-thiophene, 2-benzothiazole, 2-benzoxazole, 2-benzimidazole, 2-indole, 2-thiazolo[5,4-b]pyridine, 2-oxazolo[4,5-b]pyridine, 2-imidazo[4,5-b]pyridine, 5-thiazole, 2-thiazoline, 2-pyridine, 3-pyridine, 5-pyrimidine, 2-pyrazine, 2-triazole or 2-pyrazole wherein the heterocyclic compound may be unsubstituted or substituted independently with R.sup.4 or R.sup.5 wherein R.sup.4 and R.sup.5 are H, C.sub.1-5 alkyl, aryl or R.sup.4 and R.sup.5 may be ortho substituents on the heterocyclic compounds and connected to form an aryl or heteroaryl ring,A represents a cyclic amino acid, X is oxygen atom, thiomethlene or methylene residue, m is an integer from 1 to 5, to a process for the preparation thereof, to composition containing them, and to the use thereof.