反应详情

To a solution of tert-butyl 2-(4-ethyl-5-oxo-2,5-dihydrofuran-3-yl)-1-oxo-2,8-diazaspiro[4.5]decane-8-carboxylate (0.34 g, 0.93 mmol) in dichloromethane (1 mL) was added trifluoroacetic acid (2.16 mL, 28 mmol) and the resulting solution was stirred at rt for 1 h. After removing the volatiles, the residue was dissolved in dichloromethane (2 mL) and treated with hydrogen chloride (2 mL, 4 N in dioxane) and the mixture was concentrated to give 2-(4-ethyl-5-oxo-2,5-dihydrofuran-3-yl)-2,8-diazaspiro[4.5]decan-1-one. LC/MS: (M+1)+: 265.16.

1. customAfter removing the volatiles
2. dissolutionthe residue was dissolved in dichloromethane (2 mL)
3. additiontreated with hydrogen chloride (2 mL, 4 N in dioxane)
4. concentrationthe mixture was concentrated