Tert-butyl 2-oxo-7-azaspiro3.5nonane-7-carboxylate丨CAS 203661-69-2

tert-Butyl 2-oxo-7-azaspiro[3.5]nonane-7-carboxylate is a valuable spirocyclic intermediate widely used in medicinal chemistry and pharmaceutical synthesis. Its spiro[3.5]nonane scaffold introduces conformational rigidity, which is highly desirable for drug design as it can improve target specificity and metabolic stability. The compound's keto and tert-butyl ester functional groups allow versatile chemical transformations, including reductions, amide coupling, and deprotection reactions, making it suitable for the synthesis of small-molecule therapeutics, heterocyclic compounds, and peptidomimetics. It is particularly useful in the development of central nervous system (CNS) active agents, enzyme inhibitors, and receptor modulators, where the rigid spirocyclic framework enhances binding affinity and pharmacokinetic properties. Additionally, it serves as a key intermediate in structure–activity relationship (SAR) studies, facilitating the exploration of novel bioactive molecules.

The benefits of tert-Butyl 2-oxo-7-azaspiro[3.5]nonane-7-carboxylate stem from its chemical stability, stereochemical rigidity, and functional versatility. The spirocyclic core imparts structural rigidity that often improves receptor binding selectivity and reduces conformational entropy penalties in drug-target interactions. The tert-butyl ester protects the carboxyl group during multi-step synthesis, allowing selective transformations at other reactive sites without unwanted side reactions. Its keto functionality provides a reactive handle for derivatization, enabling the construction of diverse analogs. These properties make the compound suitable for high-yield, reproducible synthesis and support its use in both laboratory-scale medicinal chemistry and industrial-scale drug development.