4-Amino-3-pyridinecarboxaldehyde is an organic compound featuring both an amino group and an aldehyde group on a pyridine ring. This bifunctional structure makes it a versatile building block in heterocyclic chemistry. Its primary application is as a key pharmaceutical intermediate. It serves as a crucial precursor in the synthesis of various biologically active molecules, particularly kinase inhibitors. For instance, it is a documented intermediate in the synthesis of the anticancer drug Crizotinib, a c-Met/ALK inhibitor. The aldehyde group allows for further functionalization through condensation reactions, while the amino group can participate in amide bond formation or serve as a directing group. As a heterocyclic amine with a reactive aldehyde, it is also employed in the synthesis of other complex nitrogen-containing heterocycles and ligands for coordination chemistry. It is typically handled under inert atmosphere due to the sensitivity of the aldehyde group.