反应详情

To a suspension of 4-{2-[5-(4-acetylpiperazin-1-yl)pyridin-2-yl]ethyl}benzyl tert-butyl hydrazine-1,2-dicarboxylate (139.2 mg, 0.2797 mmol) in anhydrous dichloromethane (1.4 ml) was added 4M hydrogen chloride dioxane solution (1.4 ml, 5.6 mmol). After stirring at room temperature for 8 hrs, the mixture was concentrated under reduced pressure. Ethyl acetate was added to the concentrated residue, and the mixture was concentrated again under reduced pressure. The operation was repeated twice to azeotropically remove hydrogen chloride gas. The residue was dissolved in ethanol (6 ml), and ethyl acetate (30 ml) was added. The precipitated solid was filtered and dried under reduced pressure to give the title compound (105.3 mg, yield 74.3%) as a slightly yellow solid.

1. concentrationthe mixture was concentrated under reduced pressure
2. additionEthyl acetate was added to the concentrated residue
3. concentrationthe mixture was concentrated again under reduced pressure
4. dissolutionThe residue was dissolved in ethanol (6 ml)
5. additionethyl acetate (30 ml) was added
6. filtrationThe precipitated solid was filtered
7. customdried under reduced pressure