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HONGKUN / PRODUCT DIRECTORY

7-ZACA (Cefazolin nucleus) | CAS 30246-33-4

The C3 methylthiadiazolylthiomethyl side chain is already present in 7-ZACA, leaving its 7-amino group available for cefazolin side-chain installation; qualification centres on nucleus identity, configuration and the specified free-acid form.

CAS30246-33-4
Molecular formulaC11H12N4O3S3
Molecular weight344.4 g/mol

Product overview

Unlike a minimally substituted aminocephem, 7-ZACA already carries a sulfur-linked 5-methyl-1,3,4-thiadiazole unit at C3. The molecule combines that substituent with a free 7-amino group, the 6R,7R beta-lactam nucleus and a carboxylic acid. This architecture explains its description as a cefazolin nucleus: the C3 side chain is in place while the amino position remains available for acylation. CAS 30246-33-4 refers to the free acid, which should be distinguished from salts or solvated forms encountered in process literature. Procurement review should connect chemical identity to the intended acylation system and establish suitable controls for related nuclei, stereochemical composition and the basis of the reported assay.

Chemical identity

Chemical name
7-ZACA (Cefazolin nucleus)
CAS number
30246-33-4
Molecular formula
C11H12N4O3S3
Molecular weight
344.4 g/mol

Application context

7-ZACA is a cefazolin nucleus with the C3 methylthiadiazolylthiomethyl side chain already installed. Its free 7-amino group receives the acyl component needed for cefazolin assembly. Published process research also examines penicillin acylase variants with 7-ZACA and methyl 1H-tetrazol-1-ylacetate. When evaluating material for chemical or enzymatic acylation, identify the selected process and agree controls for related nuclei, stereochemical composition and free-acid content. These criteria support comparison of samples under the receiving process conditions.

Chemistry and synthetic role

7-ZACA acts as an amino acyl acceptor in the cited cefazolin chemistry. Its preinstalled sulfur-linked heterocycle distinguishes it from nuclei carrying an unsubstituted thiadiazole or a different C3 group.

Quality review

Confirm the methylthiadiazole side chain

Identify the complete C3 substituent, including the methyl group; a generic sulfur-containing cephem description is insufficient.

Distinguish free acid from process salts

Match the offered chemical form to CAS 30246-33-4 and agree the assay basis before calculating a charge.

Review 6R,7R nucleus quality

Discuss relevant stereochemical and beta-lactam related substances with the receiving process team.

Preparing a specification

Specify 7-ZACA free acid, its 6R,7R configuration and complete C3 side-chain identity. Set the assay basis and chromatographic criteria for relevant nuclei and process impurities; explain whether qualification concerns chemical or enzymatic acylation.

Packaging and storage

Confirm packaging format, net weight and transport arrangements for the selected grade, quantity and destination. Agree storage and handling conditions using the actual supplied material’s SDS and label.

Documentation

Request batch identity evidence, the proposed specification, COA and SDS. Confirm availability of related-substance chromatograms and a clear statement of chemical form and assay calculation.

Procurement questions

Why is 7-ZACA described as a cefazolin nucleus?

Its C3 side chain is already installed, while the free 7-amino group can receive the cefazolin acyl component.

What should an enquiry for enzymatic acylation include?

Identify the enzyme system and required free-acid form, then agree assay and related-substance criteria for evaluation in that process.

Can a salt use the same assay basis as the free acid?

Only with an explicit, agreed conversion. The chemical form must first be established.

Technical sources
  1. PubChem CID 6350581: Cefazolin deacylatedNCBI / PubChem
  2. (6R,7R)-7-Amino-3-(((5-methyl-1,3,4-thiadiazol-2-yl)thio)methyl)... BL3H97A48934BLD Pharmatech via Sigma-Aldrich partner catalogue
  3. CN102605033B: Preparation method of cefazolin intermediate TDACNIPA patent publication via Google Patents
  4. Computational design of penicillin acylase variants with improved kinetic selectivity for enzymatic synthesis of cefazolinBiochemical Engineering Journal / Elsevier