Used as an intermediate in the synthesis of pharmaceuticals, particularly in the development of active pharmaceutical ingredients (APIs) where indoline scaffolds are present. It serves as a protected form of indoline-2-carboxylic acid, allowing selective reactions at other functional groups during multi-step organic syntheses. Commonly applied in the preparation of protease inhibitors, kinase inhibitors, and other bioactive molecules in medicinal chemistry. Its Boc-protected amine group ensures stability and compatibility with various reaction conditions, making it valuable in solid-phase and solution-phase peptide-like couplings.