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HONGKUN / PRODUCT DIRECTORY

Ethyl 2-ethoxy-1-[(2′-cyanobiphenyl-4-yl)methyl]-1H-benzimidazole-7-carboxylate | CAS 139481-41-7

This benzimidazole intermediate combines a biphenyl nitrile with an ethyl carboxylate in a published candesartan route, making nitrile conversion, ester identity and positional assignment central to its technical definition.

CAS139481-41-7
Molecular formulaC26H23N3O3
Molecular weight425.5 g/mol

Product overview

A biphenyl nitrile and benzimidazole ethyl carboxylate define this candesartan intermediate stage. The molecule retains a 2-ethoxy group and an N-benzyl linkage. Qualification should establish the nitrile/ethyl-ester combination, the carboxylate position and separation from route-relevant tetrazole or hydrolysed forms.

Chemical identity

Chemical name
Ethyl 2-ethoxy-1-[(2′-cyanobiphenyl-4-yl)methyl]-1H-benzimidazole-7-carboxylate
CAS number
139481-41-7
Molecular formula
C26H23N3O3
Molecular weight
425.5 g/mol

Application context

A reported candesartan route converts the biphenyl nitrile to a tetrazole and hydrolyses the ethyl ester before later cilexetil ester formation. This intermediate supplies the benzimidazole–biphenyl framework at the nitrile/ethyl-ester stage. State the intended conversion and define relevant tetrazole- or acid-related controls according to the selected preparation and receiving process.

Chemistry and synthetic role

The benzimidazole nitrogen carries a biphenylmethyl group bearing the nitrile, while the ring carboxyl function remains an ethyl ester. These groups have separate roles in the candesartan sequence: nitrile conversion builds the tetrazole and ester hydrolysis exposes the carboxylic acid.

Quality review

Confirm nitrile and ethyl ester identity

Identification should distinguish this precursor from tetrazole-containing, hydrolysed or cilexetil-ester material.

Check the benzimidazole substitution pattern

Review structure-based identification for the carboxylate position and nitrogen substitution; a route code alone does not establish regiochemical identity.

Define route-related separation

Ask which related compounds are resolved by the proposed chromatographic method. Add tetrazole or acid controls only when justified by the manufacturing or intended use route.

Preparing a specification

State the full chemical name, CAS 139481-41-7, ethyl ester form and chromatographic assay or purity basis. Define related-substance targets with the proposed manufacturer and identify the downstream conversion for which the batch is being qualified.

Packaging and storage

Agree packaging, net weight and transport arrangements for the selected grade, quantity and destination. Confirm storage and handling conditions using the current SDS for the proposed material.

Documentation

Request the specification, batch COA, structure-identification data and analytical method. Confirm availability of chromatographic evidence for any critical related compound. Where C6 is used internally, include an explicit mapping between that code and the verified chemical identity.

Procurement questions

Is this candesartan cilexetil?

No. It retains a nitrile and an ethyl ester; the published route changes these groups before reaching the cilexetil product.

Is C6 a sufficient purchasing name?

No. A route code should be accompanied by the full structure-based name and CAS number.

Should a tetrazole impurity limit always be imposed?

Its relevance depends on the production and use routes. First establish whether it is a credible analytical target and whether the method resolves it.

Technical sources
  1. PubChem CID 15434963 — structure propertiesPubChem / NCBI
  2. PubChem CID 15434963 — CAS and synonymsPubChem / NCBI
  3. Ethyl 1-((2′-cyano-[1,1′-biphenyl]-4-yl)methyl)-2-ethoxy-1H-benzo[d]imidazole-7-carboxylateBide Pharmatech / Sigma-Aldrich partner catalogue
  4. WO2008012372A1 — Process for the preparation of candesartan cilexetil form IPatent applicant via Google Patents