Used as a key intermediate in the synthesis of indole-based pharmaceuticals, particularly in the development of kinase inhibitors and antitumor agents. The aldehyde and bromo functional groups allow for selective cross-coupling reactions and further derivatization, such as Suzuki or Wittig reactions, enabling the construction of complex heterocyclic systems. The Boc-protected nitrogen ensures stability during reactions and can be deprotected to introduce amine functionalities later in the synthetic pathway. Commonly employed in medicinal chemistry for generating libraries of bioactive compounds targeting cancer and inflammatory diseases.