Diethyl 2-(phenylamino)malonate is widely 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 drugs with therapeutic properties. Additionally, it is utilized in the preparation of dyes and pigments, contributing to the coloration of various materials. Its reactivity and versatility make it valuable in constructing complex molecular structures in research and industrial applications.