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HONGKUN / PRODUCT DIRECTORY

2,4-Diamino-6-chloropyrimidine | CAS 156-83-2

A diaminopyrimidine carrying a remaining ring-chloro function, identified in published minoxidil-route chemistry, where distinguishing the unoxidised starting base from N-oxide and downstream substituted materials is central to a clear procurement specification.

CAS156-83-2
Molecular formulaC4H5ClN4
Molecular weight144.56 g/mol

Product overview

Two amino groups at C2 and C4 accompany chlorine at C6 of this pyrimidine ring. CAS 156-83-2 identifies the unoxidised base, also named 6-chloro-2,4-diaminopyrimidine. The oxygen-free formula distinguishes this stage from N-oxide intermediates used later in some minoxidil synthesis routes. Its combination of amino substitution and a remaining chloro site is relevant to subsequent ring transformations. Purchasing specifications should identify this route stage and define the related compounds that the analytical method must resolve, together with the assay basis and water requirement.

Chemical identity

Chemical name
2,4-Diamino-6-chloropyrimidine
CAS number
156-83-2
Molecular formula
C4H5ClN4
Molecular weight
144.56 g/mol

Application context

2,4-Diamino-6-chloropyrimidine appears as an upstream building block in published minoxidil synthesis routes involving further substitution and oxidation. The two amino groups form part of the pyrimidine framework, while the remaining chloro position provides a site for subsequent transformation. Select the unoxidised base specified in the receiving process, and distinguish it analytically from N-oxide and substituted downstream intermediates. Qualification can include a route-specific reaction test alongside identity, assay and related-substance analysis.

Chemistry and synthetic role

The ring nitrogens, two amino substituents and C6 chlorine create a multiply functionalised pyrimidine. Subsequent transformation of the chloro site and ring oxidation belong to the downstream route; they are not part of this starting material’s identity.

Quality review

Confirm amino and chlorine positions

Use a structure-sensitive identification alongside the assay so that a different chlorodiaminopyrimidine is not accepted by a generic name.

Distinguish the oxidation stage

The requested compound is unoxidised. Where relevant, require the method to distinguish N-oxide or downstream route species from the starting base.

Define related-substance reporting

Agree a suitable chromatographic method, impurity list and assay basis; specify water separately when calculating process charges.

Preparing a specification

State CAS 156-83-2, unoxidised 2,4-diamino-6-chloropyrimidine and the intended route stage. Specify identity, assay method, relevant aminopyrimidine-related substances and water on an agreed basis; do not substitute a minoxidil specification.

Packaging and storage

Packaging format, closure and net weight should be agreed for the selected grade, order quantity and destination. Request the actual supplier SDS and confirm its storage and transport instructions before receipt.

Documentation

Request the proposed specification, batch COA and SDS. Confirm availability of identity spectra and chromatograms demonstrating separation of route-relevant substances, with residual-solvent information where needed.

Procurement questions

Which chemical stage should the enquiry identify?

Specify the unoxidised 2,4-diamino-6-chloropyrimidine base and distinguish it from N-oxide or substituted intermediates used later.

Does the formula include an N-oxide oxygen?

No. C4H5ClN4 is the unoxidised compound; an N-oxide is a different route stage.

Are the two name orders equivalent?

Yes. 2,4-Diamino-6-chloropyrimidine and 6-chloro-2,4-diaminopyrimidine identify the same substitution pattern.

Technical sources
  1. PubChem CID 67432NCBI / PubChem
  2. 6-Chloro-2,4-diaminopyrimidine C0811Tokyo Chemical Industry
  3. CN113979952A — Preparation method of minoxidilPublished patent via Google Patents