Used as an intermediate in the synthesis of active pharmaceutical ingredients, serving as a building block for piperazine structures commonly found in drugs targeting the central nervous system, such as antipsychotics, antidepressants, or psychotropic agents. The tert-butyl carbamate group protects the piperazine nitrogen during synthesis and can be deprotected later to reveal the core structure. The methanesulfonyloxy (mesyloxy) group functions as a good leaving group, facilitating nucleophilic substitution reactions to form bonds with other compounds. This makes it essential for constructing complex drug molecules, particularly those enhancing receptor binding for neurological and psychiatric conditions. Commonly employed in medicinal chemistry to create piperazine-based derivatives with improved pharmacokinetic properties.