tert-Butyl (S)-2-(methoxy(methyl)carbamoyl)azetidine-1-carboxylate is a protected chiral azetidine derivative featuring a Boc (tert-butoxycarbonyl) group on the nitrogen and a Weinreb amide (N-methoxy-N-methylcarboxamide) at the 2-position. Used as an intermediate in the synthesis of biologically active compounds, particularly in the development of pharmaceuticals. Its chiral azetidine core makes it valuable in constructing enzyme inhibitors and receptor modulators. The Weinreb amide functionality allows for selective conversion to ketones, facilitating the introduction of diverse substituents in drug scaffolds. Commonly employed in medicinal chemistry for optimizing metabolic stability and improving pharmacokinetic properties of drug candidates. Also utilized in the preparation of protease inhibitors and other therapeutic agents where ring strain and conformational rigidity are beneficial.