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Description of route of synthesis:
Add zinc copper catalyst to ethylene glycol dimethyl ether solvent, add N-Boc-4-methylpiperidine, and then dropwise add trichloroacetyl chloride for cycloaddition reaction to construct a spirocyclic ketone structure; After the reaction is complete, the solid catalyst is filtered off, extracted with ethyl acetate, washed with water to remove water-soluble impurities, and the organic phase is concentrated and refined to obtain tert butyl 2-oxo-7-azaspiro [3.5] nonane-7-formate.
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