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HONGKUN / PRODUCT DIRECTORY

8-Bromo-3-methylxanthine | CAS 93703-24-3

An early xanthine building block in reported linagliptin synthesis, bearing N3-methyl and C8-bromo groups while leaving nitrogen sites available for further substitution. Qualification includes separation of the non-brominated 3-methylxanthine precursor.

CAS93703-24-3
Molecular formulaC6H5BrN4O2

Product overview

An N3 methyl group and C8 bromine define this early xanthine building block. The nitrogen positions used for later butynyl and quinazolinylmethyl installation remain at the earlier substitution stage. Identity review should confirm methyl position and bromination, while the related-substance method addresses the non-brominated 3-methylxanthine precursor.

Chemical identity

Chemical name
8-Bromo-3-methylxanthine
CAS number
93703-24-3
Molecular formula
C6H5BrN4O2

Application context

In reported linagliptin synthesis, 8-bromo-3-methylxanthine provides the xanthine framework before the N7-butynyl and N1-quinazolinylmethyl substituents are introduced. Its C8 bromine and N3 methyl group define this starting stage. A related-substance method should resolve residual non-brominated 3-methylxanthine and relevant methylxanthine species for the receiving process.

Chemistry and synthetic role

The xanthine core contains two carbonyl groups, an N3-methyl substituent and bromine at C8. Other nitrogen positions remain available for later route-specific substitution. Positional identification is needed to distinguish a correct building block from another methylated xanthine.

Quality review

Evaluate the non-brominated precursor

Confirm that the related-substance method resolves 3-methylxanthine from the target brominated compound, and agree its reporting basis and acceptance limit for the receiving process.

Confirm N3 methyl and C8 bromine

Use structure-sensitive identification; a general xanthine label and molecular mass do not fully establish substitution positions.

Keep assay and area purity distinct

Agree the meaning of titration or content results and chromatographic purity, including their specificity and reporting basis.

Preparing a specification

Specify the exact N3-methyl/C8-bromo structure, CAS and intended starting-material stage. Agree the content basis and a related-substance method that addresses 3-methylxanthine where relevant; set limits through process qualification.

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 structural identification, a representative chromatogram and evidence of method separation for the relevant precursor. Confirm availability of batch COA, SDS and the assay calculation basis from the selected source.

Procurement questions

Is this the butynyl-substituted intermediate?

No. CAS 93703-24-3 is the earlier 8-bromo-3-methylxanthine before the N7-butynyl substituent is introduced.

Why is 3-methylxanthine a useful discussion point?

It is the non-brominated precursor. Its separation from 8-bromo-3-methylxanthine is relevant when assessing residual starting material and consistency of the brominated input.

How should residual 3-methylxanthine be specified?

Agree its chromatographic separation, reporting basis and acceptance limit according to the qualified downstream process.

Technical sources
  1. PubChem CID 1548797: properties and CAS synonym crosscheckNCBI / PubChem
  2. 8-Bromo-3-methylxanthine — B4134Tokyo Chemical Industry
  3. CN112379018A: Method for detecting 3-methylxanthine in linagliptin starting material APatent publication / Google Patents