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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

T15-AE — Cefdinir Active Thioester | CAS 104797-47-9

An O-acetyl-protected Z-oxime acylating reagent documented in cefdinir synthesis, combining an aminothiazole side chain with a benzothiazolyl thioester whose identity and hydrolysis-related impurity profile require separate review.

CAS104797-47-9
Molecular formulaC14H10N4O3S3
Molecular weight378.5 g/mol

Product overview

The acetyl group on the oxime oxygen distinguishes T15-AE from the methoxyimino active thioesters used in other cephalosporin routes. Its second defining feature is the benzothiazolyl thioester, which supplies an activated acyl group while the aminothiazole amino group remains unprotected. CAS 104797-47-9 identifies this neutral, Z-configured compound, rather than a salt or a finished antibiotic. In a published cefdinir sequence, these two structural features serve different purposes: the thioester participates in side-chain coupling, and the oxime O-acetyl group is subsequently removed. Material qualification therefore needs to resolve both the oxime protection pattern and the integrity of the activated thioester, with analytical criteria matched to the intended route.

Chemical identity

Chemical name
S-(Benzothiazol-2-yl) (Z)-2-(acetoxyimino)-2-(2-aminothiazol-4-yl)ethanethioate (T15-AE)
CAS number
104797-47-9
Molecular formula
C14H10N4O3S3
Molecular weight
378.5 g/mol

Application context

T15-AE is the side-chain reagent in a published cefdinir process using 7-AVCA. Its benzothiazolyl thioester acylates the cephem 7-amino group, introducing an aminothiazolyl oxime side chain. Subsequent hydrolysis removes the oxime O-acetyl protection. The thioester and O-acetyl group therefore have separate functions and need separate analytical attention. For this route, specify Z-oxime identity and methods that distinguish the starting reagent, its O-deacetylated counterpart and the corresponding side-chain acid.

Chemistry and synthetic role

The molecule combines two sulfur-containing heterocycles with a Z-configured oxime. The benzothiazolyl thioester transfers the acyl group, while acetylation of the oxime oxygen provides separate protection. Thioester cleavage produces the corresponding side-chain acid; O-deacetylation changes the oxime protection state. Analytical methods should distinguish these two changes when assessing related substances.

Quality review

Identify the oxime protecting group

Confirm O-acetyl oxime identity using the full structure and a suitable identification method. The O-methyl analogue MAEM is a different compound; an AE abbreviation alone is insufficient for order confirmation.

Resolve oxime geometry

Ask whether the proposed chromatographic method distinguishes the specified Z form from an E-related component. Set acceptance criteria for the intended route; optical purity is not a substitute for geometric-isomer assessment.

Distinguish thioester cleavage from O-deacetylation

The corresponding acid and the O-deacetylated thioester are different related substances. Agree their analytical separation and route-specific acceptance criteria.

Preparing a specification

An RFQ should state CAS 104797-47-9, T15-AE, the Z oxime configuration and O-acetyl protection, together with the required thioester identity. Define the assay or chromatographic purity basis, Z/E assessment and any route-critical limits for the corresponding acid and O-deacetylated material. Include water testing only where the receiving process requires an agreed criterion.

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 and batch COA, and confirm availability of identity evidence and chromatographic information addressing oxime geometry and the relevant hydrolysis products. Where route qualification requires it, request the analytical method and information on water determination. Document availability depends on the selected manufacturer and grade.

Procurement questions

Can T15-AE be replaced by MAEM in a purchase order?

They have different oxime substituents: T15-AE has O-acetyl protection, while MAEM has an O-methyl group. Specify the exact CAS and structure; substitution requires technical route assessment.

What happens to the O-acetyl group in the documented cefdinir route?

In the published cefdinir sequence, the O-acetyl group is removed by hydrolysis after side-chain coupling.

Is a high chromatographic area percentage sufficient for qualification?

Only if the method provides the necessary selectivity and the reporting basis is understood. Confirm that identity, Z/E composition and relevant thioester or oxime-related substances are adequately assessed.

Technical sources
  1. PubChem CID11417595: Z-acetoxyimino aminothiazolyl benzothiazolyl thioesterNCBI / PubChem
  2. S-2-Benzothiazolyl (Z)-2-(2-aminothiazol-4-yl)-2-acetyloxyiminothioacetate Q960AK Scientific
  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