反应详情

1,8-Diazabicyclo[5,4,0]undec-7-ene (0.62 g, 4.08 mmol) was added to a stirred suspension of 4-(aminomethyl)-2-(2,6-dioxo(3-piperidyl))isoindoline-1,3-dione hydrochloride (0.6 g, 1.85 mmol) in CH3CN (50 mL). After stirring for 20 min, butyryl chloride (0.24 g, 2.22 mmol) was added. The mixture was stirred at room temperature for 17 hours. The solvent was removed in vacuo and the residue was dissolved in CH2Cl2 (70 mL). The CH2Cl2 solution was washed with H2O (30 mL), brine (30 mL) and dried (MgSO4). The solvent was removed in vacuo and residue was purified by chromatography (SiO2, CH2Cl2:EtOAc 1:1) to give N-{[2-(2,6-dioxo(3-piperidyl))-1,3-dioxoisoindolin-4-yl]methyl}butanamide (0.41 g, 62%) as a white solid. mp 121-123° C.; 1H NMR (DMSO-d6) δ 11.14 (s, 1H), 8.44 (t, J=5.55 Hz, 1H), 7.87-7.66 (m, 3H), 5.19-5.12 (dd, J=5.1 and 12.4 Hz, 1H), 4.72 (d, J=5.6 Hz, 2H), 2.96-2.85 (m, 1H), 2.63-2.51 (m, 2H), 2.17 (t, J=7.2 Hz, 2H), 2.08-2.04 (m, 1H), 1.63-1.51 (m, 2H), 0.87 (t, J=7.3 Hz, 3H); 13C NMR (DMSO-d6) δ 172.71, 172.47, 169.77, 167.46, 166.92, 139.53, 134.68, 133.11, 131.49, 127.04, 121.77, 48.84, 37.55, 37.16, 30.91, 21.96, 18.60, 13.63; Anal. Calcd. For C18H19N3O5: C, 60.50; H, 5.36; N, 11.76. Found: C, 60.46; H, 5.36; N, 11.59.

1. stirringThe mixture was stirred at room temperature for 17 hours
2. customThe solvent was removed in vacuo
3. dissolutionthe residue was dissolved in CH2Cl2 (70 mL)
4. washThe CH2Cl2 solution was washed with H2O (30 mL), brine (30 mL)
5. dry with materialdried (MgSO4)
6. customThe solvent was removed in vacuo and residue
7. customwas purified by chromatography (SiO2, CH2Cl2:EtOAc 1:1)