Boc-L-Alaninal is a protected amino aldehyde derivative of L-alanine. It features a tert-butoxycarbonyl (Boc) protecting group on the amine functionality and an aldehyde group at the C-terminus. This compound is a white to off-white crystalline powder. Its primary application is as a versatile chiral building block in organic synthesis, particularly for the preparation of pharmaceuticals and bioactive peptides. The aldehyde group is a key reactive handle for various transformations, including reductive amination, Wittig reactions, and nucleophilic additions, enabling the construction of complex molecules. It is frequently employed in the synthesis of protease inhibitors, peptidomimetics, and other drug candidates where the L-alanine scaffold is required. As a Boc-protected amino aldehyde, it offers advantages in peptide synthesis by providing orthogonal protection strategies. It is sensitive to moisture and should be stored under inert conditions.