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The starting material is prepared as follows: The mixture of 200 g of 3,3-tetramethyleneglutaric anhydride, 57 g of 4-aminopyridine and 1,500 ml of xylene is stirred and refluxed on a water separator for 3 days. After cooling slightly, the xylene solution is decanted from a small amount of oily material, and after cooling in an ice bath, the collected residue dissolved in 1,500 ml of boiling ethanol, the solution cooled to 5°, filtered and the residue dried, to yield the 8-(4-pyridyl)-8-azaspiro[4,5]decan-7,9-dione melting at 208°-211°.

1. customThe starting material is prepared
2. temperatureAfter cooling slightly
3. customthe xylene solution is decanted from a small amount of oily material
4. temperatureafter cooling in an ice bath
5. dissolutionthe collected residue dissolved in 1,500 ml of boiling ethanol
6. temperaturethe solution cooled to 5°
7. filtrationfiltered
8. customthe residue dried