Methyl 6-chloronicotinate is an organic compound featuring a pyridine ring substituted with a chlorine atom at the 6-position and a methyl ester group at the 3-position. It is a white to off-white crystalline powder with a molecular formula of C7H6ClNO2 and a molecular weight of 171.58 g/mol. This compound serves as a crucial pharmaceutical intermediate. Its primary application is in the synthesis of various active pharmaceutical ingredients (APIs), particularly those targeting the central nervous system. For instance, it is a key building block in the production of Vilazodone, an antidepressant medication that acts as a selective serotonin reuptake inhibitor (SSRI) and a 5-HT1A receptor partial agonist. The chlorine atom and the ester group provide reactive handles for further functionalization, making it a versatile synthon in medicinal chemistry for constructing substituted nicotinic acid derivatives. As a chlorinated nicotinate ester, it is a valuable heterocyclic building block in organic synthesis beyond pharmaceutical applications. It is commonly used in cross-coupling reactions, such as Suzuki-Miyaura couplings, to introduce the functionalized pyridine moiety into more complex molecular architectures.