3-(Boc-amino)phenylboronic acid is a bifunctional organic compound featuring both a boronic acid group and a tert-butoxycarbonyl (Boc)-protected amino group attached to a phenyl ring. This structure makes it a versatile building block in organic synthesis, particularly for the construction of complex molecules via Suzuki-Miyaura cross-coupling reactions and as a precursor for aniline derivatives after deprotection. Its primary application is in medicinal chemistry and pharmaceutical research as a key intermediate in the synthesis of active pharmaceutical ingredients (APIs) and drug candidates. The boronic acid moiety enables efficient carbon-carbon bond formation to create biaryl structures, which are common motifs in many drugs. The Boc-protected amine provides a handle for further functionalization, allowing for the introduction of nitrogen-containing pharmacophores. It is frequently employed in the synthesis of kinase inhibitors and other small molecule therapeutics. As a commercially available and well-characterized reagent, it is widely used in parallel synthesis and combinatorial chemistry for library generation. Proper handling is required due to the potential sensitivity of the boronic acid group to protic solvents and oxidation.