4-Aminoquinaldine is primarily used in the synthesis of various pharmaceutical compounds, particularly those with antimicrobial and antimalarial properties. It serves as a key intermediate in the development of quinolone antibiotics, which are effective against a wide range of bacterial infections. Additionally, it is utilized in organic chemistry research for the preparation of heterocyclic compounds, which are important in drug discovery and development. Its derivatives are also explored for their potential in treating parasitic diseases and as building blocks for more complex chemical structures in medicinal chemistry.