How is (S)-5-(tert-Butoxycarbonyl)-5-azaspiro[2.4]heptane-6-carboxylic acid (CAS: 1129634-44-1) typically synthesized?

(S)-5-(tert-Butoxycarbonyl)-5-azaspiro[2.4]heptane-6-carboxylic acid can be synthesized through a multistep process involving the formation of a tert-butoxycarbonyl protected derivative from its parent azaspiro compound. The synthesis typically involves protecting groups, such as tert-butoxycarbonyl (Boc), to enhance chemical reactivity and control the reaction pathway. The final product is obtained through careful purification steps and is often used in the subsequent synthesis of more complex molecules.