Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors and other biologically active molecules. Its aldehyde group at position 5 allows for further functionalization through reactions such as reductive amination or Wittig reactions, enabling the construction of complex indoline-based structures. The Boc-protected amine ensures stability during synthetic transformations and can be selectively deprotected to introduce amine-containing side chains. Commonly employed in medicinal chemistry for the preparation of drug candidates targeting cancer, neurological disorders, and inflammatory diseases.