Product Description
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2-Bromo-3-methyl-5-chloropyridine is a specialized heterocyclic building block widely utilized in modern organic synthesis and pharmaceutical research. With the chemical formula C6H5BrClN and the CAS Registry Number 100976-48-5, this compound features a pyridine ring substituted with a bromine atom at the second position, a methyl group at the third position, and a chlorine atom at the fifth position. This unique substitution pattern imparts specific reactivity profiles that make it an invaluable intermediate for constructing complex nitrogen-containing architectures.
The primary application of 2-bromo-3-methyl-5-chloropyridine lies in transition metal-catalyzed cross-coupling reactions. The presence of both bromine and chlorine atoms on the aromatic ring allows for chemoselective functionalization. Typically, the carbon-bromine bond is more reactive than the carbon-chlorine bond under palladium or nickel catalysis, enabling selective coupling at the C2 position while leaving the C5 chlorine intact for subsequent modifications. This dual-reactivity feature is crucial for stepwise synthesis strategies where multiple substituents are required on the final molecule. Consequently, it serves as a key precursor in the development of agrochemicals, including herbicides and fungicides, which often rely on substituted pyridine scaffolds for biological activity.
Furthermore, this intermediate plays a significant role in medicinal chemistry, particularly in the synthesis of kinase inhibitors and other bioactive small molecules. Researchers frequently employ it to introduce diverse side chains via Suzuki-Miyaura, Stille, or Buchwald-Hartwig couplings, thereby diversifying the chemical space for drug discovery campaigns. The methyl group at the C3 position can also influence the metabolic stability and lipophilicity of the resulting compounds, adding another layer of tunability to the synthetic process. Due to its sensitivity to moisture and potential toxicity associated with halogenated aromatics, handling requires standard safety precautions, including the use of fume hoods and appropriate personal protective equipment. As a versatile scaffold, 2-bromo-3-methyl-5-chloropyridine continues to support advancements in materials science and the creation of novel therapeutic agents, bridging the gap between simple heterocycles and complex functional drugs. Its availability from major chemical suppliers ensures accessibility for academic and industrial laboratories seeking efficient routes to advanced nitrogenous compounds.