Widely used as a key intermediate in pharmaceutical synthesis, particularly in the development of kinase inhibitors and other biologically active compounds. The tert-butyl carboxylate serves as a protecting group for the pyrazole nitrogen, preventing tautomerism and enabling regioselective reactions in multi-step syntheses. This feature, combined with the free 4-amino group, makes it valuable in the preparation of drug candidates targeting cancer, inflammation, and central nervous system disorders. The compound’s stability and reactivity profile support its use in combinatorial chemistry and high-throughput screening for new therapeutic agents.