反应详情

4 N HCl-1,4-dioxane (200 mL) was added to 40.6 g tert-butyl 4-oxo-6-(1H-tetrazol-5-yl)spiro[chroman-2,4′-piperidine]-1′-carboxylate produced in Reference Example 17, and stirred at room temperature for 5 hours. The reaction mixture was concentrated, and the residue was triturated with methanol. The insoluble solid was collected through filtration, and dried under reduced pressure to obtain 6-(1H-tetrazol-5-yl)-spiro[chroman-2,4′-piperidine]-4-one as a colorless solid.

1. customproduced in Reference Example 17
2. concentrationThe reaction mixture was concentrated
3. customthe residue was triturated with methanol
4. filtrationThe insoluble solid was collected through filtration
5. customdried under reduced pressure