Skip to product details

Chemical product profile

HONGKUN / PRODUCT DIRECTORY

8-Bromo-7-(but-2-yn-1-yl)-3-methylxanthine | CAS 666816-98-4

A nitrogen-substituted xanthine that already carries the N7-butynyl chain while retaining C8 bromine and an unsubstituted N1 site, positioning it between early xanthine material and advanced linagliptin intermediates.

CAS666816-98-4
Molecular formulaC10H9BrN4O2
Molecular weight297.11 g/mol

Product overview

The N7-but-2-yn-1-yl chain is already installed on this N3-methyl xanthine, while N1 remains available and C8 retains bromine. These features define an intermediate stage of linagliptin assembly. Confirm the nitrogen-substitution pattern and distinguish the earlier N7-unsubstituted precursor from the later quinazolinylmethyl-containing compound.

Chemical identity

Chemical name
8-Bromo-7-(but-2-yn-1-yl)-3-methylxanthine
CAS number
666816-98-4
Molecular formula
C10H9BrN4O2
Molecular weight
297.11 g/mol

Application context

In a reported linagliptin sequence, the available N1 site reacts with 2-(chloromethyl)-4-methylquinazoline to form the quinazolinylmethyl-substituted bromoxanthine. The N7-butynyl chain is already installed and C8 remains brominated. Analytical review should distinguish incorrect nitrogen substitution and relevant carryover from the earlier bromoxanthine or the later N1-substituted stage.

Chemistry and synthetic role

The N7 substituent is a four-carbon chain attached through its first carbon, with an internal triple bond between carbons two and three. N3 is methylated, N1 remains available for the documented next substitution, and C8 bears bromine.

Quality review

Verify N7 attachment

Confirm the butynyl chain is attached at the required nitrogen rather than another ring site; use a method suitable for relevant positional isomers.

Distinguish adjacent route stages

Check analytical discrimination from 8-bromo-3-methylxanthine and the subsequent N1-quinazolinylmethyl intermediate where those substances are relevant.

Confirm retained C8 bromine

Identity and related-substance review should support the required brominated stage rather than an already substituted downstream product.

Preparing a specification

Specify CAS, N3-methyl/N7-but-2-yn-1-yl identity and the unmodified N1 stage. Agree assay basis, positional-isomer controls and relevant precursor or downstream-related-substance separation. Add water or solvent criteria only with a process basis.

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 complete structural identification, the proposed related-substance method and a representative chromatogram. Confirm availability of batch COA, SDS and evidence supporting the nitrogen-substitution positions required by the route.

Procurement questions

Is this the same as CAS 93703-24-3?

No. This compound additionally contains the N7-butynyl chain.

Does it already contain the quinazoline fragment?

No. The documented next assembly introduces that group at N1.

Should E/Z purity be specified for the butynyl group?

An internal alkyne does not have alkene E/Z isomerism. Review attachment position and structural identity instead.

Which isomer controls are relevant to this precursor?

Focus on N3-methyl and N7-butynyl placement, the free N1 site and retained C8 bromine. The isolated precursor has no carbon stereocentre.

Technical sources
  1. PubChem CID 21088927: properties and CAS synonym crosscheckNCBI / PubChem
  2. 8-Bromo-7-(2-butyn-1-yl)-3-methylxanthine — B4454Tokyo Chemical Industry
  3. CN112961155A: Preparation method of linagliptinPatent publication / Google Patents