摘要:
The invention concerns 7.beta.-amino-cepham-3-one-4-carboxylic acid compounds, particularly esters thereof, and the N-substituted, especially N-acylated derivatives of such compounds. They can be used as intermediates, for example, for the manufacture of the corresponding enol ethers and esters, as well as the corresponding 3-unsubstituted 7.beta.-amino-3-cephem-4-carboxylic acid compounds, which show outstanding pharmacological effects.
摘要:
This invention provides a process for preparing 3-exomethylenecepham derivatives represented by the formula ##STR1## wherein R.sup.1 is arylacetylamino, aryloxyacetylamino, heterocyclic acetylamino or imido, and R.sup.2 is a protective group for the carboxyl, the process being characterized in that a 3-halomethylcephem compound represented by the formula ##STR2## wherein R.sup.1 and R.sup.2 are as defined above, and X is a halogen atom is electrolyzed in a mixture of a hydrophilic organic solvent and water.
摘要:
Process and intermediate products useful in the preparation of cephalosporin compounds having a substituent at the 7-position in place of hydrogen are provided. The new cephalosporin compounds are active against various gram-negative and gram-positive organisms.
摘要:
Process and intermediate products useful in the preparation of cephalosporin compounds having a substituent at the 7-position in place of hydrogen are provided. The new cephalosporin compounds are active against various gram-negative and gram-positive organisms.
摘要:
Novel 3-acyloxymethyl-cephem compounds of the formula: ##STR1## wherein R.sup.1 is hydrogen or an acyl group; W is acetonyl, or a group represented by --X--COOH or --X--OH (X is an organic residue) or salts thereof were found to be useful as starting materials for preparing cephalosporins of the formula: ##STR2## wherein R.sup.3 stands for a residue of a nucleophilic compound and R.sup.1 has the same meaning as above.
摘要:
A process for preparing 3-iodomethyl cephalosporins wherein a 3-alkanoyloxymethyl or 3-carbamoyloxymethyl cephalosporin is reacted with a trialkylsilyl iodide, e.g. trimethylsilyl iodide. Certain cephalosporin esters, e.g., benzhydryl esters, undergo cleavage and cephalosporin sulfoxides are reduced to the sulfide form in the process. The 3-iodomethyl cephalosporins are useful intermediates for antibiotics.
摘要:
A process for preparing a 7-substituted-3-cephem-4-carboxylic acid of the formula: ##STR1## or a pharmaceutically acceptable salt thereof, which comprises subjecting a corresponding 7-substituted-3-organic sulfonyloxy-3-cephem-4-carboxylic acid ester of the formula ##STR2## wherein R is a residue of an organic sulfonic acid, X is esterified carboxy which is an alkoxylcarbonyl, haloalkoxycarbonyl, substituted or unsubstituted aralkoxycarbonyl, benzhydryloxycarbonyl or trityloxycarbonyl, or a pharmaceutically acceptable salt thereof,to hydrogenolysis using a combination of a metal and formic acid as a reducing reagent.
摘要:
Alcohols are reacted with certain isocyanate compounds to produce the N-substituted carbamoyloxy derivatives which are cleaved to obtain the carbamate.
摘要:
A process of preparing a .DELTA..sup.3 -cephalosporanic acid ester derivative which comprises reacting a cephalosporanic acid sulfoxide ester derivative with thionyl halide or a phosphorous halide.The compounds prepared by the process of this invention are useful as intermediate compounds for preparing cephalosporin antibiotics and the compounds themselves are also potential antibacterials.
摘要:
Cephalosporin intermediates of the formulas ##STR1## wherein R is lower alkyl, 2,2,2-trichloroethyl, diphenylmethyl, p-methoxybenzyl, or p-nitrobenzyl; R.sub.1 is lower alkyl or phenyl; R.sub.2 is hydrogen or acetoxy; R.sub.4 is methyl or ethyl; and R.sub.5 is hydrogen, methyl, or methoxy; are disclosed. Methods of reacting these intermediates to prepare antibacterially active cephalosporins are disclosed.