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Cefotetan

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Cefotetan Basic information
Cefotetan Chemical Properties
  • Melting point:173-178°C (dec.)
  • Density 1.5157 (rough estimate)
  • refractive index 1.7400 (estimate)
  • storage temp. Store at 0-5°C
  • pka1.69±0.41(Predicted)
  • Merck 14,1934
  • InChIKeySRZNHPXWXCNNDU-IXOPCIAXSA-N
  • CAS DataBase Reference69712-56-7(CAS DataBase Reference)
Safety Information
  • RTECS XI0330800
  • HS Code 2941906000
Cefotetan Usage And Synthesis
  • DescriptionCefotetan is comparatively stable, lasting for approximately 24 hours at room temperature when reconstituted. Slight yellowing and slight darkening produce materials that are still acceptable for therapy. Cefotetan is chemically incompatible with tetracycline, aminoglycosides, and with heparin, often forming precipitates with them. With respect to its molecular mode of action, it has a special affinity for PBP-3 of Gram-negative bacteria, consequently producing filamentous forms. It also binds well with PBP-1A and -1B,therefore leading to cell lysis and death. Whereas it is stable to a wide range of β-lactamases, it also is a potent inducer in some bacteria.
  • Chemical PropertiesOff-White Solid
  • Usesantibacterial
  • UsesCefotetan disodium is an antibiotic related to Cephalosporin, used in the treatment of bacterial infections.
  • DefinitionChEBI: A semi-synthetic cephalosporin antibiotic with [(1-methyl-1H-tetrazol-5-yl)sulfanyl]methyl, methoxy and {[4-(2-amino-1-carboxy-2-oxoethylidene)-1,3-dithietan-2-yl]carbonyl}amino groups at the 3, 7alpha, and 7bet positions, respectively, of the cephem skeleton. It is resistant to a wide range of beta-lactamases and is active against a broad spectrum of aerobic and anaerobic Gram-positive and Gram-negative microorganisms.
  • brand nameCefotan (Zeneca).
  • Antimicrobial activityA semisynthetic cephamycin formulated as the disodium salt for intravenous administration. The activity is similar to that of cefoxitin, but cefotetan exhibits more potent activity against enterobacteria and more modest activity against Staph. aureus.
    A 1 g intravenous dose achieves a serum concentration of 140–180 mg/L. There is no evidence of accumulation on a dosage of 1 g every 12 h. Tissue fluid concentrations are about 30% of the simultaneous serum level. The plasma half-life is about 3 h and protein binding is around 88%.
    About 85% of the drug is eliminated in the urine over 24 h. Accumulation in renal failure is inversely related to the creatinine clearance, the plasma half-life rising to 20 h in patients requiring hemodialysis. During hemodialysis the half-life falls to around 7.5 h and on peritoneal dialysis it falls to 15.5 h, 5–10% of the dose being recovered in the dialysate over 24 h.
    Side effects are those typical of the group. Anaphylaxis has been described. Because of the methylthiotetrazole side chain there is some risk of hypoprothrombinemia, and disulfiramlike reactions can occur. Marked changes in the bowel flora, with appearance of C. difficile, have been reported. Uses are similar to those of other cephamycins, but it is not widely available.
  • Chemical SynthesisCefotetan, 7β-[(-carbamoylcarboxylatomethylen)-1,3-dithietan-2-yl]-carboxamido-7-methoxy-3-(1-methyltetrazol-5-yl)-thiomethyl-3-cefem-4-carboxylic acid (32.1.2.43), is synthesized by the following scheme. First, trisodium salt of 4-carboxy-3-hydroxy-5-mercaptoisothiazole (32.1.2.41) undergoes S-alkylation by 7β-bromoacetamido-7α-methoxycephalosporanic acid, which is synthesized by a scheme described previously (32.1.2.31) → (32.1.2.37), the only difference being that the acylation in the stage (32.1.2.35) → (32.1.2.36) is accomplished not with 2-(2-thienyl)acetylchloride, but with bromoacetyl bromide. Next, upon reacting the resulting product (32.1.2.42) with 1-methyl-1,2,3,4-tetrazol-5-thiol in the presence of sodium bicarbonate with the expected replacement reaction, in the reaction conditions a ring rearrangement takes place in which the isothiazole ring is opened, and transformed into a derivative of carbamoylcarboxylatomethylen-1,3-dithiethane, namely cefotetan (32.1.2.43).

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