Diethyl 2-((phenylamino)methylene)malonate is primarily used as an intermediate in organic synthesis, particularly in the production of pharmaceuticals and agrochemicals. It plays a key role in the synthesis of heterocyclic compounds, which are essential in developing active pharmaceutical ingredients (APIs). The compound is also utilized in the preparation of dyes and pigments due to its ability to form stable intermediates. Additionally, it finds application in research laboratories for studying reaction mechanisms and developing new synthetic pathways. Its versatility makes it valuable in creating complex molecules for various industrial and scientific purposes.