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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

Protected 3-hydroxy cephem | CAS 54639-48-4

A protected 6R,7R cephem with a ring-bound C3 hydroxy group, benzhydryl ester and C7 phenylacetamido substituent; these three structural features define the material to match when evaluating subsequent cephalosporin chemistry.

CAS54639-48-4
Molecular formulaC28H24N2O5S
Molecular weight500.6 g/mol

Product overview

CAS 54639-48-4 identifies a 6R,7R cephem with a benzhydryl carboxylate ester and a phenylacetamido group at C7. The hydroxy group is attached directly to C3 of the ring, distinguishing it from the hydroxymethyl group of D-7ACA. The carboxyl and amino functions are therefore present in protected or substituted forms. When selecting this nucleus for cephalosporin intermediate work, use the complete structure to specify the reaction stage. Confirm both retained substituents, ring configuration and chemical form before comparing assay or related-substance results.

Chemical identity

Chemical name
Benzhydryl (6R,7R)-3-hydroxy-8-oxo-7-(2-phenylacetamido)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate
CAS number
54639-48-4
Molecular formula
C28H24N2O5S
Molecular weight
500.6 g/mol

Application context

This protected 3-hydroxy cephem is a building block for cephalosporin intermediate chemistry. Its directly attached C3 hydroxy group, benzhydryl carboxylate ester and C7 phenylacetamido group define the stage represented by the purchased material. Route matching should therefore use the full structure and the 6R,7R configuration. Compare samples with methods that distinguish the required protected nucleus from deprotected or differently substituted cephems, and agree the assay basis for the intended subsequent transformation.

Chemistry and synthetic role

The ring hydroxy group and protected carboxyl function coexist with an intact beta-lactam nucleus. Changes to either the benzhydryl ester or the C7 acyl group define different materials and should not be hidden within the same commercial shorthand.

Quality review

Check both substituent forms

Confirm the benzhydryl ester and C7 phenylacetamido group; a deprotected acid or amino nucleus is not an equivalent identity.

Distinguish hydroxy from hydroxymethyl

Use structural evidence appropriate to the direct C3-OH connection, rather than relying on the phrase hydroxy cephalosporin.

Review the protected nucleus

Agree controls for relevant stereochemical variants, deprotected species and beta-lactam-related substances according to the intended next step.

Preparing a specification

Give the complete 6R,7R structure, CAS 54639-48-4 and both protected substituent forms. State assay and related-substance requirements for the intended transformation, including how structurally different or deprotected components will be assessed.

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 evidence distinguishing the protected structure from deprotected analogues. Confirm availability of chromatograms and methods relevant to the intended impurity review.

Procurement questions

Is this a free 7-amino nucleus?

No. C7 carries a phenylacetamido group, and the carboxyl function is a benzhydryl ester.

Does 3-hydroxy mean 3-hydroxymethyl?

No. The hydroxy group is directly attached to the ring in this compound.

What should define route compatibility?

Match the direct C3-OH, benzhydryl ester and C7 phenylacetamido group to the structure required for the next transformation.

Technical sources
  1. PubChem CID 54721268: Benzhydryl (6R,7R)-3-hydroxy...carboxylateNCBI / PubChem
  2. 7-Phenylacetamido-3-hydroxy-3-cephem-4-carboxylic acid diphenylmethyl ester J10211AK Scientific
  3. EVULTIS product brochure, β-lactam intermediates tableEVULTIS SA; hosted by Friulchem