2-(2,6-Dioxo-3-piperidyl)-4-(2-methoxyethylamino)isoindoline-1,3-dione → 4-(3-Chloro-benzylamino)-2-(2,6-dioxo-piperidin-3-yl)-isoindole-1,3-dione

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3-(3-Chloro-benzylamino)-phthalic acid (4.8 mmol) was treated in the same manner as described above for the synthesis of 2-(2,6-dioxo-piperidin-3-yl)-4-(2-methoxy-ethylamino)-isoindole-1,3-dione. The solid yellow residue was slurried in diethyl ether (30 ml) for 18 h and filtered to give 1.42 g (89%) of product as a yellow solid: mp 207–209° C.; 1H NMR (DMSO-d6) δ 11.11 (s, 1H), 7.55–7.28 (m, 6H), 7.03 (d, J=7.0 Hz, 1H), 6.95 (d, J=8.6 Hz, 1H), 5.08 (dd, J=5.4 and 12.4 Hz, 1H), 4.58 (d, J=6.3 Hz, 2H), 2.98–2.83 (m, 1H), 2.64–2.46 (m, 2H), 2.08–2.04 (m, 1H); 13C NMR (DMSO-d6) δ 172.56, 169.84, 168.59, 167.11, 145.76, 141.68, 136.01, 133.10, 132.16, 130.25, 126.83, 126.68, 125.48, 117.40, 110.81, 109.74, 48.54, 41.54, 44.80, 30.87, 22.05; Anal. Calcd. For C20H16ClN3O4: C, 60.38; H, 4.05; N, 10.56. Found: C, 60.22; H, 4.05; N, 10.38.

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