Abstract:
The compounds of the formula (XVII) ##STR1## and their esters wherein R.sub.2 is a hydrogen, fluorine, chlorine or bromine atom or an alkyl group of 1-3 carbon atoms, an alkoxyl group of 1-3 carbon atoms, an acyloxyl group of 1-3 atoms, a hydroxyl group, an alkoxycarbonyl group containing 1-3 carbon atoms in the alkoxy part, or a group --N(R.sub.5)CO.R.sub.6, --N(R.sub.5)SO.sub.2 R.sub.6 or --CO-NR.sub.5 R.sub.6 where R.sub.5 is a hydrogen atom or an alkyl group of 1-3 carbon atoms or a phenyl or benzyl group and R.sub.6 is an alkyl group of 1-3 carbon atoms or a phenyl or benzyl group; R.sub.3 is a hydrogen, fluorine or chlorine atom or an alkyl group of 1-3 carbon atoms, an alkoxyl group of 1-3 carbon atoms; or an acyloxyl group of 1-3 carbon atoms R.sub.4 is a hydrogen fluorine or chlorine atom or an alkyl group of 1-3 atoms or an alkoxyl group of 1-3 carbon atoms; and X is a bond or alkylene group of 1-4 carbon atoms; have been found to be .beta.-lactamase inhibitors and antibacterial agents. Their preparation and use is described.
Abstract:
Disclosed are 6- and 6,6-disubstituted-2-substituted-oxapen-2-em-3-carboxylic acids of the following structure: ##STR1## wherein: R.sup.1 and R.sup.2 are independently selected from hydrogen, alkyl, alkoxyl, aralkyl, aryl, heterocyclyl and heterocyclylalkyl; R is selected from hydrogen, --OR, --SR, --NR.sub.2, alkyl, aryl, aralkyl, heterocyclyl, or heterocyclylalkyl. Such compounds and their pharmaceutically acceptable salt, and ester derivatives are useful as antibiotics. Also disclosed are processes for the preparation of such compounds, pharmaceutical compositions comprising such compounds and methods of treatment comprising administering such compounds and compositions when an antibiotic effect is indicated.
Abstract:
Compounds of the formula (II): ##STR1## wherein X is S, SO or SO.sub.2 ; and R is (a) an alkyl group of up to 4 carbon atoms, (b) an alkyl group of up to 4 carbon atoms substituted by an OR.sup.1, NHR.sup.1, NH.CO.R.sup.1 or CO.sub.2 R.sup.2 group wherein R.sup.1 is a hydrogen atoms, an alkyl group of up to 4 carbon atoms or benzyl group, and R.sup.2 is a moiety such that CO.sub.2 R.sup.2 is a carboxyl, salted carboxyl or esterified carboxyl group, (c) an aryl group or (d) an aralkyl group are useful for their anti-fungal and .beta.-lactamase inhibitory properties.
Abstract:
The present invention provides a process for the preparation of potassium clavulanate which process comprises contacting a concentrated solution of lithium clavulanate with a concentrated solution of potassium fluoride, potassium orthophosphate, potassium metaphosphate potassium carbonate or potassium bicarbonate, separating off the resulting precipitated lithium fluoride, lithium orthophosphate, lithium metaphosphate or lithium carbonate and thereafter recovering the potassium clavulanate from solution.
Abstract:
The invention provides a novel process for opening the ring of 2-R-6-(1'-R.sup.1 -oxycarbonyl-2'-methyl-prop-1'-enyl)-1-oxa-3,6-diaza-4S,5R-bicyclo[3,2,0]hept-2-en-7-one by treatment with a sulfonic acid salt thereby forming R.sup.1 2-(2'R-R-oxy-3'S-amino-4'-oxo)azetidinyl-3-methyl-2-butenoate sulfonic acid salts which can provide oxapenicillins by two different routes depending on the substituent desired on the carboxamido group of the 1-oxapenicillins. In the alternate processes, new intermediates are also provided.
Abstract:
Compounds of the formula (II): ##STR1## wherein R is hydrogen, is useful for its antibacterial activity and as a synergist for penicillins and cephalosporins.
Abstract:
Through total synthesis methods developed in the assignee's laboratories, new as well as old penicillin and cephalosporin compounds (all containing the beta-lactam functional group) have been prepared. One of the key intermediates prepared by total synthesis has the 7-amino (6-amino in the case of a penicillin derivative) group in the alpha configuration. The instant invention provides a general route for preparing the 7.beta.-amino (or 6.beta.-amino) compound, through the formation of an imino-containing intermediate, followed by hydrolysis to the desired epimer. Novel intermediate products are provided. The compounds having the desired beta epimer can be converted to acylaminoantibiotics.
Abstract:
Compounds of the formula (II) ##STR1## wherein R.sub.1 is CH.sub.3, CH.sub.2 OH, CHO or CH.sub.2 OCOR.sub.4 wherein R.sub.4 is a hydrocarbon of 1-7 carbon atoms andR.sub.2 is a group of the formula R.sub.3 or COR.sub.3 wherein R.sub.3 is a hydrocarbon of 1-7 carbon atoms optionally inertly substituted by halogen are useful as antibacterial agents and .beta.-lactamase inhibitory agents.
Abstract:
The compounds of the formula (I): ##STR1## wherein X represents a moiety of the sub-formula (a) or (b): ##STR2## HAVE BEEN FOUND TO BE .beta.-LACTAMASE INHIBITORS WHICH MAY BE USED IN PHARMACEUTICAL COMPOSITIONS TO ENHANCE THE EFFECTIVENESS OF PENICILLINS OR CEPHALOSPORINS. The diene of the formula (I) may be produced by the decarboxylation of clavulanic acid or a derivative thereof and the monoene of the formula (I) may be produced by the 1,4 addition of hydrogen to the diene of the formula (I). The diene is thus also useful as a chemical intermediate and other such uses are demonstrated.
Abstract:
.beta.-Lactamase inhibitory and antibacterial compounds of the formula: ##STR1## wherein R is a hydrogen atom or an acyl group and salts and esters thereof, are produced and pharmaceutical compositions containing the same.