N-Boc-4-pinacolboron-L-phenylalanine is a chiral, non-natural amino acid derivative. Its structure features an L-phenylalanine backbone with a Boc (tert-butoxycarbonyl) group protecting the amine functionality and a pinacol boronate ester (BPin) group installed at the para-position of the phenyl ring. This compound is a white to off-white solid. The primary application of this molecule is as a key chiral building block in medicinal chemistry and peptide research. The presence of the boronate ester makes it a versatile intermediate for Suzuki-Miyaura cross-coupling reactions, a powerful method for forming carbon-carbon bonds. This allows for the late-stage diversification of the phenylalanine side chain to introduce various aryl or heteroaryl groups, which is crucial for structure-activity relationship (SAR) studies in drug discovery. The Boc-protected amine and the chiral center are essential for the synthesis of modified peptides and peptidomimetics. As a bifunctional reagent containing both a protected amino acid and an organoboron handle, it serves as a valuable synthon for constructing complex, biologically active molecules. It is typically handled under inert atmosphere and stored at low temperatures to maintain stability.