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Description
TCI D3558 4,6-Dichloro-2-methylpyrimidine is a nitrogen-containing heterocyclic intermediate that appears very frequently in the synthetic routes toward active compounds. Its molecule consists of a pyrimidine core bearing two chlorine atoms at positions 4 and 6, together with a single methyl group at position 2. Its role in the laboratory is to supply a ready-to-use pyrimidine scaffold that can be functionalized in sequence. Because the pyrimidine core is a motif encountered in nucleic acid bases as well as in many drug molecules, this material serves as a practical entry point for medicinal chemistry and agrochemical research.
The principal characteristic of this building block is the ease with which its chlorine atoms can be replaced through nucleophilic aromatic substitution. The pyrimidine ring is electron-deficient, so positions 4 and 6 are highly susceptible to attack by amines, alkoxides, thiolates, and stabilized carbanions. What makes it particularly valuable is that replacement of the first chlorine lowers the reactivity of the second position, allowing researchers to install two different substituents in a stepwise manner simply by adjusting temperature, base, and stoichiometry. The methyl group at position 2 contributes moderate steric and electronic stability while remaining available for further functionalization, for example through radical halogenation.
In Indonesian laboratories, this compound is typically handled as a starting material for multi-step synthesis in university research groups, pharmaceutical and agrochemical R&D units, and contract synthesis laboratories. It is normally used in small to moderate quantities inside a fume hood, weighed out for each substitution step, and carried forward into purification and structural confirmation. Because it is supplied as a defined catalogue item from TCI, it fits routine method development work where a consistent, well-identified heterocyclic scaffold is required.
Laboratory Applications
- Medicinal chemistry scaffold synthesis: the two displaceable chlorines let researchers build substituted pyrimidine libraries around a drug-relevant core using stepwise nucleophilic aromatic substitution under controlled conditions.
- Agrochemical research and development: pyrimidine motifs are common in crop protection chemistry, and this intermediate provides a direct route into differently substituted analogues for structure-activity screening.
- Sequential difunctionalization studies: because substitution of the first chlorine reduces reactivity at the second position, this material is well suited to teaching and probing selective, controlled two-step substitution chemistry.
- Amine, alkoxide, and thiolate coupling reactions: the electron-deficient ring readily accepts these nucleophiles at positions 4 and 6, making the compound a reliable substrate for building C–N, C–O, and C–S bonds.
- Further side-chain elaboration work: the methyl group at position 2 can be functionalized further, for example by radical halogenation, giving an additional vector for extending the molecular framework.
Specifications
- Brand: TCI
- CAS number: 1780-26-3
- Category: Chemistry > Building Blocks > Heterocyclic Building Blocks
- Chemical name: 4,6-Dichloro-2-methylpyrimidine
- Pack sizes: available in standard TCI catalogue research pack sizes; please confirm the size required when ordering
- Storage: keep in the tightly closed original container, protected from moisture; follow the storage statement on the manufacturer's label and Safety Data Sheet
Handling and Storage
Store the container tightly closed in a cool, dry, well-ventilated area away from moisture, direct sunlight, and incompatible materials such as strong bases and oxidizing agents. Keep the material in its original manufacturer container, or transfer it to a clean, chemically compatible, well-sealed amber glass container clearly labelled with the compound name and CAS number. Handle all weighing and transfer operations in a fume hood, wearing safety glasses, a lab coat, and suitable chemical-resistant gloves, and avoid inhaling dust or allowing skin and eye contact. Chlorinated heterocycles can release irritating decomposition products, so avoid heating in open vessels. Always consult the manufacturer's Safety Data Sheet before use, and collect residues and contaminated consumables as halogenated organic chemical waste for disposal according to your institution's procedures.
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