tert-Butyl (3-(methylamino)propyl)carbamate is a bifunctional protected amine used as an intermediate in organic synthesis. It features a Boc-protected primary amine and a free secondary methylamino group, enabling selective reactions at the unprotected site in multi-step syntheses, particularly in the pharmaceutical industry for constructing complex amine-containing molecules and active pharmaceutical ingredients (APIs). The Boc group allows controlled deprotection under mild acidic conditions to release the primary amine for further functionalization without affecting other parts of the molecule. It is also employed in the preparation of agrochemicals and specialty polymers due to its stability and reactivity profile.