Methyl 5-bromo-6-methylnicotinate

This compound is typically obtained as an off-white to pale yellow crystalline powder. Its molecular formula is C8H8BrNO2, corresponding to a molecular weight of 230.06. The melting point generally falls within the range of 78–82°C. The calculated density is approximately 1.60 g/cm³ under ambient conditions. It is soluble in common organic solvents including dichloromethane, ethyl acetate, tetrahydrofuran, and methanol, while exhibiting limited solubility in water and negligible solubility in aliphatic hydrocarbons such as hexane. The molecule consists of a pyridine ring with a bromine atom at the 5position, a methyl group at the 6position, and a methyl ester at the 3position. The ester functionality is susceptible to hydrolysis under acidic or basic conditions, while the bromine atom provides a versatile handle for transitionmetalcatalyzed crosscoupling reactions. Storage in tightly sealed containers protected from light and moisture under cool, dry conditions is recommended. Contact with strong oxidizing agents, strong acids, and strong bases should be avoided.

Methyl 5-bromo-6-methylnicotinate is a trisubstituted pyridine derivative belonging to the nicotinic acid ester family. The molecule combines three distinct functional groups: a bromine atom at the 5position, a methyl group at the 6position, and a methyl ester at the 3position of the pyridine ring. The pyridine core, with its electronwithdrawing nitrogen atom, provides a moderately electrondeficient aromatic platform capable of engaging in πstacking and hydrogen bonding interactions. The bromine atom serves as a versatile electrophilic handle for palladiumcatalyzed crosscoupling reactions such as Suzuki, Sonogashira, and BuchwaldHartwig couplings, enabling the introduction of diverse aryl, heteroaryl, or amino groups. The methyl group at the 6position contributes hydrophobic character and steric influence, modulating the overall lipophilicity and binding interactions. The methyl ester provides a protected carboxylic acid equivalent, offering a site for further functionalization through hydrolysis, transesterification, or reduction to the corresponding alcohol. This combination of a modifiable halogen, an alkyl substituent, and a latent carboxylic acid on a privileged heteroaromatic core makes the compound a valuable building block in medicinal chemistry and organic synthesis for constructing more complex molecules with potential biological activity.

Pharmaceutical Intermediate
In drug discovery, this brominated pyridine ester is employed as a building block for synthesizing compounds with potential activity against cancer, inflammation, and infectious diseases. The bromine atom enables latestage diversification through crosscoupling reactions, allowing systematic exploration of structureactivity relationships. The ester can be hydrolyzed to the carboxylic acid for amide coupling with aminecontaining pharmacophores, enabling rapid generation of libraries for biological screening. The methyl group can influence metabolic stability and binding affinity through hydrophobic interactions with target proteins.

Building Block for Heterocyclic Systems
The compound serves as a precursor for constructing fused heterocyclic systems such as pyrido[2,3d]pyrimidines, pyrazolo[3,4b]pyridines, and imidazo[1,2a]pyridines through cyclocondensation reactions. The bromine can be engaged in crosscoupling to introduce substituents that participate in ringforming reactions, while the ester provides a handle for further functionalization. These ring systems are investigated for their pharmacological properties, with the rigid pyridine core providing conformational constraint beneficial for target recognition and selectivity.

Intermediate for Nicotinic Acid Derivatives
Hydrolysis of the ester yields 5-bromo-6-methylnicotinic acid, a valuable building block for preparing nicotinic acid analogs with potential biological activity. These derivatives are explored for their ability to modulate lipid metabolism, act as antidyslipidemic agents, or serve as ligands for Gprotein coupled receptors. The bromine atom enables further functionalization through crosscoupling to optimize potency and selectivity, while the methyl group can influence pharmacokinetic properties.

Organic Synthesis Building Block
As a versatile synthetic intermediate, methyl 5-bromo-6-methylnicotinate participates in diverse transformations including palladiumcatalyzed crosscouplings, nucleophilic aromatic substitution (under forcing conditions), and directed metalation strategies. The bromine can be replaced with various nucleophiles or converted to organometallic species for further functionalization. The ester can be reduced to the corresponding alcohol for ether formation or converted to other functional groups. The methyl group provides a site for radical or metalcatalyzed C–H functionalization, enabling the introduction of additional diversity. Its utility extends to the synthesis of natural product analogs and functional materials where the pyridine ring imparts desirable electronic and hydrogenbonding properties.