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Description
TCI D4231 2,5-Diamino-4,6-dichloropyrimidine is a heterocyclic building block that combines two amino groups and two chlorine atoms on a single pyrimidine ring. This pairing of electron-donating and electron-withdrawing substituents makes it a highly valuable precursor for constructing nitrogen-containing fused ring systems, particularly purines, pteridines, and other substituted pyrimidine derivatives. In synthetic laboratories, the compound serves as a starting point that shortens synthetic routes, because the required substitution pattern is already installed from the outset, allowing researchers to focus directly on the ring-forming and diversification stages of their work.
The characteristic that makes this compound a preferred choice is the complementary reactivity of its four substituents. The two chlorine atoms at positions 4 and 6 sit on an electron-poor ring and are therefore readily displaced by amines, alkoxides, or thiolates through nucleophilic aromatic substitution. Meanwhile, the pair of amino groups at positions 2 and 5 is ready to be condensed with aldehydes, carboxylic acids, or their derivatives to close an imidazole or pyrazine ring. This arrangement closely resembles the framework of nucleic acid bases, which makes it highly efficient for preparing analogues of these structures.
In Indonesian laboratories, this building block is typically used in university research groups, medicinal chemistry laboratories, and organic synthesis facilities working on nitrogen heterocycles. It is handled on a small to moderate scale in fume-hood-based synthetic work, where the two reactive handles allow sequential functionalisation without lengthy preparatory steps. Its role is that of a convenient entry point for teams building purine and pteridine scaffolds or exploring substituted pyrimidine chemistry for research purposes.
Laboratory Applications
- Purine scaffold synthesis: the 4,5-diamino-type relationship on the ring allows direct condensation to close an imidazole ring, giving rapid access to purine cores without lengthy preliminary functionalisation steps.
- Pteridine construction: the adjacent amino groups condense with suitable carbonyl partners to form the fused pyrazine ring, making this compound an efficient entry point into pteridine chemistry for research programmes.
- Nucleic acid base analogue preparation: the substitution pattern closely mirrors natural nucleobase frameworks, so researchers can prepare structural analogues while retaining the recognition features of the parent heterocyclic system.
- Sequential nucleophilic aromatic substitution: the electron-poor ring bearing chlorine at positions 4 and 6 permits controlled displacement by amines, alkoxides, or thiolates to build diverse substituted pyrimidine libraries.
- Medicinal chemistry intermediate work: the compound provides two distinct classes of reactive handles on one small scaffold, letting chemists diversify at several points and generate structure-activity relationship series efficiently.
Specifications
- Brand: TCI
- CAS number: 55583-59-0
- Chemical name: 2,5-Diamino-4,6-dichloropyrimidine
- Product code: D4231
- Category: Chemistry > Building Blocks > Heterocyclic Building Blocks
- Packaging and storage: supplied in standard TCI research pack sizes; store in a tightly closed container as indicated on the manufacturer's label
Handling and Storage
Store the container tightly closed in a cool, dry, and well-ventilated area, away from direct sunlight, moisture, and incompatible reagents such as strong oxidising agents. The original manufacturer container is the most suitable storage vessel; if transfer is required, use clean, chemically resistant glass or a compatible closed container with a clear label. Handle the solid inside a fume hood to avoid inhalation of dust, and wear safety glasses, gloves, and a laboratory coat. Avoid skin and eye contact, keep the workspace clean, and follow the manufacturer's Safety Data Sheet together with your institution's chemical waste procedures for disposal of residues.
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