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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

2,6-Dichloropyrazine | CAS 4774-14-5

A dichlorinated 1,4-diazine used to build substituted aminopyrazines, including intermediates in published sulfachloropyrazine routes. Distinguishing the 2,6 and 2,3 isomers is a central qualification point.

CAS4774-14-5
Molecular formulaC4H2Cl2N2
Molecular weight148.98 g/mol

Product overview

The two chlorides in 2,6-dichloropyrazine occupy symmetry-related positions on a pyrazine ring. Replacing one chloride with an amino group creates a differentiated intermediate while retaining the second site for further chemistry. The 2,3-dichloro isomer has a different arrangement and can be relevant to route-related impurity review. This makes structural identification and chromatographic resolution more informative than a general dichloropyrazine description. Material selection should connect the intended first substitution to the related-substance specification. A buyer developing chloroaminopyrazine chemistry can request separation of positional isomers and relevant chlorination homologues, alongside an agreed assay basis and application-specific water or solvent requirements.

Chemical identity

Chemical name
2,6-Dichloropyrazine
CAS number
4774-14-5
Molecular formula
C4H2Cl2N2
Molecular weight
148.98 g/mol

Application context

Published sulfachloropyrazine sodium processes identify 2,6-dichloropyrazine as an upstream heterocyclic intermediate. Other medicinal-chemistry routes convert it to 2-chloro-6-aminopyrazine, then modify the remaining chloride to generate differently substituted pyrazines.

The starting material therefore supplies a controlled substitution pattern rather than a finished active ingredient. For the initial amination, relevant questions include the content of the 2,3 positional isomer and any mono- or more highly chlorinated components requiring control. Their limits should be selected against the actual route and the ability of subsequent purification to separate related heterocycles.

Chemistry and synthetic role

Pyrazine has nitrogens at positions 1 and 4. The two C–Cl sites are initially equivalent by symmetry; the first substitution differentiates the remaining functionality.

Quality review

Resolve 2,6 and 2,3 isomers

Agree a chromatographic method that separates these positional structures.

Review chlorination homologues

Select limits for relevant mono- and more highly chlorinated pyrazines from the proposed route.

Define the assay basis

State whether the result is area purity or content and how water and residual solvents are handled.

Preparing a specification

Request 2,6-dichloropyrazine with positional-isomer identification, a resolved 2,3-isomer test and a route-relevant chloropyrazine profile. Include the intended amination and the assay reporting basis.

Packaging and storage

Packaging, closure and net weight are agreed for the selected grade, order quantity and destination. Confirm storage and transport requirements against the actual supplier SDS.

Documentation

Request a batch COA, specification, identity data and SDS. Confirm the availability of the analytical methods and any application-specific impurity results with the proposed supplier.

Procurement questions

Are the two chlorides initially equivalent?

They are symmetry-related in the starting molecule; introducing the first substituent removes that equivalence.

Why monitor the 2,3 isomer?

It carries the same formula but a different substitution pattern that may lead to different downstream intermediates.

Is this the sulfachloropyrazine active ingredient?

No. It is an upstream pyrazine building block used in published routes to that compound.

Technical sources
  1. 2,6-Dichloropyrazine CID 78504PubChem
  2. 2,6-Dichloropyrazine 132497Sigma-Aldrich
  3. Industrial production method of 2,6-dichloropyrazineCN103288763A
  4. Bicyclylaryl-aryl-amine compounds and their useEP2288601B1