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HONGKUN / PRODUCT DIRECTORY

5-(1H-Pyrrol-1-yl)benzimidazole-2-thiol | CAS 172152-53-3

The N-pyrrolyl benzimidazole sulfur precursor appears in a published ilaprazole route before formation of the thioether linkage. Its thiol/thione naming, ring connectivity and sulfur-stage identity should be aligned across purchasing and analytical documents.

CAS172152-53-3
Molecular formulaC11H9N3S
Molecular weight215.28 g/mol

Product overview

An N-linked pyrrole at benzimidazole C5 distinguishes this sulfur building block from simpler mercaptobenzimidazoles. The C2 sulfur functionality can be represented by thiol and thione tautomeric forms; CAS 172152-53-3 and formula C11H9N3S identify the requested precursor. In published ilaprazole synthesis, it connects with a chloromethyl-substituted pyridine to form the thioether intermediate. The pyrrolyl connection and sulfur reaction stage therefore belong in the purchase specification. Qualification should establish the N-linked structure, the precursor content and separation from coupled or oxidized species relevant to the selected route. An agreed structural drawing keeps thiol/thione naming consistent across the enquiry and batch documents.

Chemical identity

Chemical name
5-(1H-Pyrrol-1-yl)-1H-benzimidazole-2-thiol
CAS number
172152-53-3
Molecular formula
C11H9N3S
Molecular weight
215.28 g/mol

Application context

Published ilaprazole routes couple this sulfur precursor with a methoxy-methyl chloromethylpyridine to form the thioether linkage. It supplies the N-pyrrolyl benzimidazole fragment and sulfur connection site. Specify the unlinked thiol/thione stage and distinguish coupled thioether or oxidized species where relevant to the selected process. Align the reference structure used for identity testing with the precursor requested; sulfoxide stereochemistry belongs to the later oxidation stage.

Chemistry and synthetic role

The pyrrole is N-linked to the benzimidazole ring. The thiol/thione functionality provides the sulfur site used for thioether formation in the patent. A stereogenic sulfoxide centre belongs to a later oxidation state, not to this incoming structure.

Quality review

Confirm the N-pyrrolyl connection

Check that pyrrole is linked through nitrogen at benzimidazole C5, rather than through a pyrrole carbon or another ring position.

Match the sulfur stage

Distinguish precursor thiol/thione from coupled thioether and oxidized products using the agreed identity reference.

Review relevant sulfur-related species

Use the proposed preparation and batch chromatogram to identify the coupled or oxidized sulfur-related species that need individual reporting and limits.

Preparing a specification

Specify CAS 172152-53-3, N-pyrrolyl connectivity and the unlinked thiol/thione precursor. Agree assay, reference structure and relevant sulfur-stage related-substance criteria.

Packaging and storage

Confirm packaging format, net weight and transport arrangements for the selected grade, order quantity and destination. Request the applicable SDS and label to establish storage and handling conditions.

Documentation

Request the proposed specification, batch COA and current SDS. Confirm availability of the analytical methods and batch evidence relevant to the intended process. Request the structural reference used for thiol/thione naming and chromatograms distinguishing relevant linked or oxidized relatives.

Procurement questions

How should thiol and thione names be handled in the specification?

Use CAS 172152-53-3 with an agreed structural drawing; thiol and thione describe tautomeric representations of this benzimidazole sulfur precursor.

Is this already ilaprazole thioether?

No. The chloromethylpyridine-derived linkage has not yet been introduced.

Should a sulfoxide enantiomer ratio be requested?

Not for this precursor as such; that question belongs to the later sulfoxide stage if relevant.

Technical sources
  1. PubChem CID 21460501: identity properties and CAS synonymsNCBI / PubChem
  2. 5-(1H-Pyrrol-1-yl)-1H-benzo[d]imidazole-2-thiolBLD Pharmatech via Sigma-Aldrich
  3. CN103073536A: Preparation method of ilaprazoleCNIPA via Google Patents