[C:1]([O:4][C:5]1[CH:15]=[CH:14][CH:13]=[C:7]2[C:8]([O:10][C:11](=[O:12])[C:6]=12)=O)(=[O:3])[CH3:2].FC(F)(F)C(O)=O.[NH2:23][CH:24]1[CH2:30][CH2:29][C:28](=[O:31])[NH:27][C:25]1=[O:26].CC([O-])=O.[Na+]>C(O)(=O)C>[O:10]=[C:8]1[C:7]2[C:6](=[C:5]([O:4][C:1](=[O:3])[CH3:2])[CH:15]=[CH:14][CH:13]=2)[C:11](=[O:12])[N:23]1[CH:24]1[CH2:30][CH2:29][C:28](=[O:31])[NH:27][C:25]1=[O:26]1,3-Dioxo-2-(2,6-dioxopiperidin-3-yl)-4-acetoxyisoindoline was prepared and isolated as follows. A mixture of 3-acetoxyphthalic anhydride (40 mg), aminoglutarimide trifluoroacetate (47 mg), and NaOAc (32 mg) in acetic acid (2 mL) was refluxed for 5 h. The solvent was evaporated, water (10 mL) was added, and the resulting solution was stirred for several minutes. The solid was filtered out and recrystallized from ethyl acetate to give 1,3-dioxo-2-(2,6-dioxopiperidin-3-yl)-4-acetoxyisoindoline as pale yellow crystals (35 mg, 66%): 1H NMR (DMSO) δ 11.16 (s, 1H), 11.07 (s, 1H), 7.64 (t, J=7.2 Hz, 1H), 7.22-7.31 (m, 2H), 5.05 (dd, J=5.4 Hz, J=12.5 Hz, 1H), 2.87-2.92 (m, 2H), 2.48 (s, 3H), 2.08-2.00 (m, 2H).
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