3-Acetoxymethylen-7-amino-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-2-carbonsure

BeschreibungThe abbreviation for 7-aminocephalosporanic acid is 7-ACA. It is a white or almost white crystalline powder and serves as a crucial nucleus in the production of cephalosporin antibiotics. By utilizing chemical transformations at positions 7 and 3 of the nucleus, numerous cephalosporins can be synthesized, including cefazolin sodium, cefotaxime sodium, ceftriaxone sodium, cefoperazone sodium, sodium ceftazidime, and cefuroxime sodium.Cephalosporin antibiotics (Cephalosporins) are a cluster of broad-spectrum semisynthetic antibiotics, they all contain the nucleus of 7-aminocephalosporanic acid (7-ACA), with different groups in the 3 and 7 carbon atoms, forming various cephalosporins with different antibacterial activity and pharmacokinetic characteristics. Cephalosporin antibiotics have broad antibacterial spectrum,strong antibacterial effect, and fewer allergic reactions, and only part of the cross allergic with penicillin and they have varying degrees of stability on the β-lactamase . Cephalosporins have fast development, and many families, they are divided into four generation cephalosporins according to the anti-microbial dynamic "generations" . They are the same as penicillin, cephalosporins contain β lactam ring , which is necessary to achieve antibacterial efficacy. But penicillins are 6-amino penicillin acid (6-aminopenicillanic acid, 6-APA) derivatives, and cephalosporins nucleus is 7-aminocephalosporanic acid (7-aminocephalosporamic acid, 7-ACA), the latter is from cephalosporin C, it is a fermentation product of Cephalosporium acremonium.7-aminocephalosporanic acid has a dihydro-thiazine ring (A) and aβ-lactam ring (B), it has a resistant effect on the class of staphylococcus aureus penicillinase. Modifying this nucleus with different side chains can form the entire series of cephalosporin antibiotics. Modifying β-lactam bit 7 (R1), can make antimicrobial efficacy and stability within the β-lactamase change. At 3 bit on-dihydro-thiazine ring substitution (R2), the influence of effect on drug metabolism and pharmacokinetic properties is more staggering than that of antibacterial effect.Cephamycins are associated with cephalosporin C in chemical structure, the main difference is that they have a 7-α-methoxy group (R3), so that the stability to certain β-lactamase is improved . Cephalosporin is a derivative cephalosporin C which is produced by Streptomyces . Cefotetan is an semi-synthetic derivative of organic mycin G, it is a product of Streptomyces organonensis. Cefmetazole is a semi-synthetic product of 7-aminocephalosporanic acid.Figure 1 the chemical structure of the 7-aminocephalosporanic acid

synthetischeThe synthesis of 7-Aminocephalosporanic acid involves esterification of semi-synthetic cephalosporin-cephalosporin C with trimethylchlorosilane, followed by phosphorus pentachloride chloride and butanol etherifying. The final product is obtained through hydrolysis. The yield from cephalosporin C sodium to 7-ACA is approximately 50%.DOI: 10.3390/jof8050450

DefinitionChEBI: 7-Aminocephalosporanic acid is the alpha,beta-unsaturated monocarboxylic acid that is the active nucleus for the synthesis of cephalosporins and intermediates. It is functionally related to a cephalosporanic acid. It is a tautomer of a 7beta-aminocephalosporanic acid zwitterion.