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HONGKUN / PRODUCT DIRECTORY

7-ATCA | CAS 155723-02-7

A defined (6R,7R), Z-configured cephalosporin nucleus for published cefditoren chemistry, combining a free 7-amino group with an installed methylthiazolylvinyl substituent whose geometric identity requires explicit control.

CAS155723-02-7
Molecular formulaC13H13N3O3S2

Product overview

7-ATCA has a preassembled C3 methylthiazolylvinyl group on a cephalosporin nucleus. The requested material is the (6R,7R), Z compound under CAS 155723-02-7, with a free 7-amino group and carboxylic acid. These features distinguish the advanced nucleus from protected precursors and the finished antibiotic. For route evaluation, specify the Z vinyl geometry and both ring stereocentres independently. Qualification should establish the complete side chain, nucleus and chemical form alongside assay and relevant related-substance results. Match the proposed grade to the receiving process and analytical requirements.

Chemical identity

Chemical name
(6R,7R)-7-Amino-3-[(Z)-2-(4-methylthiazol-5-yl)ethenyl]-3-cephem-4-carboxylic acid (7-ATCA)
CAS number
155723-02-7
Molecular formula
C13H13N3O3S2

Application context

7-ATCA is an advanced nucleus in published cefditoren pivoxil intermediate chemistry. Its C3 methylthiazolylvinyl side chain already has Z geometry, while the free 7-amino group allows further assembly. Match both that side chain and the 6R,7R cephem configuration to the receiving step. Specify separate analytical controls for E-related material, ring isomers and free-acid content.

Chemistry and synthetic role

The β-lactam-containing cephem scaffold carries a free amino group at position 7 and a carboxylic acid. The thiazolylvinyl fragment adds a separate Z/E identity requirement; ring configuration and alkene geometry are different analytical questions.

Quality review

Define the Z material

Ask how the method distinguishes the specified Z nucleus from its E counterpart; total purity alone does not describe this ratio.

Confirm both ring centres

Require evidence supporting 6R,7R identity and an agreed approach to relevant diastereomers.

Check the nucleus and amino state

Discuss methods distinguishing the free 7-amino nucleus from protected precursors and relevant β-lactam-related degradation products.

Preparing a specification

Specify CAS 155723-02-7 with the complete (6R,7R), Z structure. State chemical assay and method, geometric-isomer criteria, relevant stereochemical controls and the required free-acid/free-amino form; agree numerical limits during qualification.

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 the proposed specification, batch COA and SDS. Confirm availability of identity spectra and chromatograms demonstrating Z/E discrimination and the agreed related-substance controls.

Procurement questions

How should the required vinyl geometry be specified?

Include the complete Z structure with CAS 155723-02-7 and agree a method that distinguishes the E counterpart.

What stage of cefditoren chemistry does 7-ATCA represent?

The Z methylthiazolylvinyl side chain is installed at C3, while the 7-amino group remains free for subsequent construction.

Are E/Z control and ring stereochemistry interchangeable?

No. Alkene geometry and the 6R,7R ring centres are separate structural requirements.

Technical sources
  1. 7-ATCA CAS155723-02-7Watson International
  2. (6R,7R)-7-Amino-3-((Z)-2-(4-methylthiazol-5-yl)vinyl)…Ambeed, hosted by Sigma-Aldrich
  3. CN120536536A — A preparation method of cefditoren pivoxil intermediateCNIPA patent / Guangdong Liguo Pharmacy; Google Patents
  4. PubChem CAS resolution:155723-02-7NCBI / NLM / NIH
  5. AB511577 | CAS155723-02-7 — (6R,7R)-7-Amino-3-[(1Z)-2-(4-methyl-5-thiazolyl)ethenyl]…abcr GmbH