反应详情

4 N hydrogen chloride/dioxane solution was added to tert-butyl 6-(1-methyl-1H-pyrazol-4-yl)-4-oxospiro[chroman-2,4′-piperidine]-1′-carboxylate (1.00 g), and stirred overnight at room temperature. Ether was added to the reaction liquid, the resulted precipitate was taken out through filtration, washed with ether, and dried under reduced pressure to obtain the intended compound as a colorless solid.

1. filtrationthe resulted precipitate was taken out through filtration
2. washwashed with ether
3. customdried under reduced pressure