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HONGKUN / PRODUCT DIRECTORY

MAEM — Methoxyimino activated thioester | CAS 80756-85-0

MAEM supplies a Z-methoxyimino aminothiazole acyl component through a benzothiazolyl activated thioester, with a documented ceftriaxone route; oxime geometry, thioester-related substances and the intended synthetic or analytical use shape qualification.

CAS80756-85-0
Molecular formulaC13H10N4O2S3
Molecular weight350.4 g/mol

Product overview

MAEM combines a Z-methoxyimino group with an activated benzothiazolyl thioester. The aminothiazole amino group is free, while the thioester transfers the side-chain acyl group in published ceftriaxone synthesis. The oxime O-methyl substituent distinguishes MAEM from the O-acetyl-protected reagent T15-AE. CAS 80756-85-0 also identifies the compound used for analytical comparison as Ceftriaxone Benzothiazolyloxime. Specify whether the enquiry concerns synthesis or analytical work, then match thioester content, Z-isomer assessment and characterization to that purpose. Quantitative analytical use additionally requires a defined assigned-content basis and appropriate documentation.

Chemical identity

Chemical name
S-(Benzothiazol-2-yl) (Z)-(2-aminothiazol-4-yl)(methoxyimino)thioacetate (MAEM)
CAS number
80756-85-0
Molecular formula
C13H10N4O2S3
Molecular weight
350.4 g/mol

Application context

MAEM is an activated acyl component in published ceftriaxone synthesis. Its benzothiazolyl thioester transfers the Z-methoxyimino aminothiazole side chain to a 7-amino cephem already carrying the triazine-containing C3 group. The same compound is also used for analytical comparison under the name Ceftriaxone Benzothiazolyloxime. An enquiry should therefore distinguish synthesis use from analytical use and specify the required Z-isomer assessment, thioester content and related-substance characterization. Quantitative analytical work additionally requires an appropriate assigned-value basis.

Chemistry and synthetic role

The acyl-transfer group is a thioester, not an ordinary oxygen ester. Its aminothiazole amino group is unprotected, and the oxime oxygen bears methyl. These features distinguish MAEM from protected hydroxyimino side-chain reagents.

Quality review

Verify Z-methoxyimino identity

Confirm both oxime geometry and O-methyl substitution; a generic active-ester label does not separate MAEM from O-acetyl analogues.

Review the activated thioester

Discuss methods for the parent thioester, corresponding side-chain acid and relevant benzothiazole sulfur species.

Define analytical versus synthesis use

For analytical comparison, establish what identity or value-assignment evidence is required rather than assuming reference status from a matching CAS.

Preparing a specification

Write MAEM, CAS 80756-85-0, Z-methoxyimino identity and intended use. Agree thioester assay, oxime-isomer separation and relevant related-substance criteria; for analytical work, specify the required characterization or assignment basis.

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 specification, COA, SDS and chromatographic method. Confirm availability of Z-isomer and thioester identity data; where analytical use is intended, separately request characterization and any assigned-value documentation.

Procurement questions

Can MAEM and T15-AE be interchanged?

No. MAEM has an O-methyl oxime; T15-AE has an O-acetyl-protected oxime.

Which ceftriaxone side chain does MAEM introduce?

Its activated thioester introduces the Z-methoxyimino aminothiazole acyl group at the cephem C7 amino position.

What should be specified for quantitative analytical use?

Request the required identity characterization, assigned content and value-assignment documentation for the intended analytical method.

Technical sources
  1. PubChem CID5702580: MAEMNCBI / PubChem
  2. S-2-Benzothiazolyl (Z)-2-(2-aminothiazol-4-yl)-2-methoxyiminothioacetate B3602Tokyo Chemical Industry
  3. WO2011012965A1: Improved process for preparation of ceftriaxone disodium hemiheptahydrateNectar Lifesciences / WIPO publication via Google Patents
  4. Ceftriaxone Benzothiazolyloxime 1A08340United States Pharmacopeia via Sigma-Aldrich catalogue