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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

7-AVCA — Vinyl cephem nucleus | CAS 79349-82-9

A terminal vinyl group defines the C3 substitution of 7-AVCA, a 6R,7R amino cephem documented in cefdinir and cefixime chemistry; qualification should connect nucleus identity with the intended side-chain acylation.

CAS79349-82-9
Molecular formulaC9H10N2O3S

Product overview

The vinyl group in 7-AVCA is a structural identifier, not an abbreviation for any unsaturated cephalosporin nucleus. CAS 79349-82-9 denotes the 6R,7R free acid with an unacylated 7-amino group and a beta-lactam ring. The terminal vinyl substituent is distinct from a propenyl group and does not require its own E/Z specification. This nucleus appears in published cefdinir and cefixime intermediate chemistry, with a direct process paper describing cefdinir preparation. Purchasing should establish the exact nucleus before assessing its suitability for the chosen acyl component. Relevant review areas include stereochemical identity, related nuclei, degradation products and the distinction between chromatographic purity and usable free-acid content.

Chemical identity

Chemical name
7-Amino-3-vinylcephem-4-carboxylic acid (7-AVCA)
CAS number
79349-82-9
Molecular formula
C9H10N2O3S

Application context

7-AVCA is an amino nucleus used in published cefdinir and cefixime chemistry. In a reported cefdinir process, its 7-amino group is acylated with a benzothiazolyl thioester carrying an O-acetyl-protected oxime; the protection is then removed in a subsequent step. The C3 terminal vinyl group remains part of the nucleus. For qualification, identify the selected side-chain reagent and agree controls for the 6R,7R cephem, related nuclei, degradation products and free-acid content.

Chemistry and synthetic role

The free C7 amino group provides the side-chain attachment site in the cited route. The C3 terminal vinyl group and 6R,7R cephem configuration remain defining identity features; a propenyl or chloromethyl nucleus is different.

Quality review

Identify vinyl rather than propenyl

Confirm the terminal two-carbon unsaturation and avoid applying a propenyl E/Z criterion to this C3 group.

Review the configured cephem

Agree evidence for 6R,7R identity and relevant nucleus isomers or beta-lactam degradation products.

Clarify amino-nucleus assay

Set the free-acid content basis and discuss N-acylated or other related nuclei relevant to the receiving acylation process.

Preparing a specification

Specify 7-AVCA free acid, CAS 79349-82-9, with its 6R,7R configuration and C3 vinyl group. Identify the intended cefdinir or cefixime route and agree assay, related-substance methods and any process-dependent water requirement.

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, COA and SDS. Confirm availability of nucleus identity data, relevant chromatograms and the assay basis; discuss additional stereochemical evidence according to the receiving process.

Procurement questions

Does the vinyl group require an E/Z limit?

A terminal vinyl group has no E/Z pair. The nucleus still requires its defined 6R,7R identity.

Which cephalosporin routes use this nucleus?

It appears in cefdinir and cefixime intermediate chemistry; a published process study describes its use in cefdinir preparation.

Which assay basis is useful for charging 7-AVCA?

Agree the free-acid assay and any water or solvent correction separately from HPLC area purity.

Technical sources
  1. PubChem CID7280824: 7-AVCANCBI / PubChem
  2. 7-AVCA CIAH99BC9985ChemScene via Sigma-Aldrich partner catalogue
  3. Synthesis of Cefdinir from 7-Amino-3-vinyl Cephem-4-carboxylic Acid Using N-Methyl Morpholine as Base (2009)Muralikrishna, Chetia and Pagar, Lupin; Asian Journal of Chemistry
  4. CN106520892B: The preparation method of 7-AVCACNIPA patent publication via Google Patents