摘要:
There are provided compounds of formula I: ##STR1## wherein R.sup.1 is hydrogen or a C.sub.1 -C.sub.4 alkyl group either unsubstituted or substituted by one or more substituents chosen from a free or protected hydroxy or halogen atom;R.sup.2 is a free or esterified carboxy group or carboxylate anion;R.sup.3 and R.sup.4 are each independently hydrogen or organic group,X is --O--, ##STR2## --S--, Q is either(a") free or protected hydroxy, or(b") a C.sub.1 -C.sub.1 acyloxy, or(c") carbamoyloxy OCONH.sub.2, or(d") an optionally substituted heterocyclylthio group, or(e") an optionally substituted imido group, or(f") an optionally substituted quaternary ammonium group or(g") a halogen atom,A and the pharmaceutically or veterinarily acceptable salts thereof. There are provided also methods for preparing compounds of formula I. The compounds of formula I are useful as antibacterial agents.
摘要:
Compounds of the following formula I ##STR1## wherein X represents a sulphur or an oxygen atom,R is hydrogen or a C.sub.1 -C.sub.4 alkyl group either unsubstituted or substituted by one or more substituents chosen from a free or protected hydroxy group and halogen atom;A is a Z, Z--O--CO-- or --Z--CO-- residue, whereinZ represents(a) an optionally substituted phenylene or naphthylene group,(b) an optionally substituted heterocyclediyl radical wherein the hetero ring is mono or bicyclic, saturated or unsaturated containing at least one heteroatom selected from the group of oxygen, sulphur and nitrogen;(c) an optionally substituted linear or branched C.sub.1 -C.sub.7 alkylene radical;(d) a C.sub.2 -C.sub.4 alkenylene or alkynylene group or a group of formula ##STR2## (e) an optionally substituted C.sub.3 -C.sub.8 cycloalkylene ring; (f) an aralkylene radical of the formula ##STR3## wherein n is 1, 2 or 3; andQ.sup.(+) represents a +NR.sub.1 R.sub.2 R.sub.3 group, wherein(i) R.sub.1, R.sub.2, R.sub.3, are each independently an optionally substituted alkyl, aralkyl or aryl radical; or p1 (ii) R.sub.1 is as defined above under (i) and R.sub.2, R.sub.3 taken together with the nitrogen atom represent an optionally substituted heterocyclic or fused heterocyclic radical; or(iii) R.sub.1, R.sub.2, R.sub.3, taken together with the nitrogen atom, represent an optionally substituted azoniabicyclo or azoniatricyclo radical; or(iv) R.sub.1, R.sub.2, R.sub.3, taken together with nitrogen atom, represent an optionally substituted pyridinium, pirazinium, pyrazolium, or pyridazinium radical, such radicals being optionally fused with one phenyl ring or with a 5-7 membered, saturated or unsaturated cycloaliphatic or heterocyclic ring,or a pharmaceutically or veterinarily acceptable salt thereof having high antibacterial activity.
摘要:
Compounds of formula I ##STR1## wherein R.sub.1 and R.sub.2 is each H, halo or an organic group, R.sub.3 is H or organic group, n=1 or 2, M is a heavy mono- or divalent metal, or M.sub.2 A wherein M.sub.2 is a heavy divalent metal and A is an organic or inorganic group, are prepared by treating a starting penicillin in a solvent with a salt of M.sub.1 or M.sub.2 A in the presence of a base at a temperature of from -70.degree. to 100.degree. C.
摘要:
Unsaturated derivatives of 7-acylamido-3-cephem-4-carboxylic acid are disclosed which exhibit antibacterial activity against Gram-positive and Gram-negative microorganisms and can be used to treat infections caused by such microorganisms.