Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors for cancer treatment. Its structure, featuring a tert-butoxycarbonyl protecting group, cyano substituent, and boronic acid moiety, enables selective cross-coupling reactions, making it valuable in constructing complex indole-based molecules. Commonly employed in Suzuki-Miyaura coupling reactions to form biaryl systems found in bioactive molecules. Also utilized in medicinal chemistry for lead optimization due to its ability to enhance binding affinity and metabolic stability in drug candidates.