Reaction Steps
3-[(5-Methyl-furan-2-ylmethyl)-amino]-phthalic acid (5 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 residue was purified by preparative HPLC (Symmetry C18, isocratic, 35/65 acetonitrile/water) to give 0.31 g (20%) of product as a yellow solid: mp 305-307° C.; 1H NMR (DMSO-d6) δ 11.10 (s, 1H), 7.58 (t, J=7.7 Hz, 1H), 7.18 (d, J=8.6 Hz, 1H), 7.06 (d, J=7.1 Hz, 1H), 6.93 (t, J=6.0 Hz, 1H), 6.22 (d, J=2.9 Hz, 1H), 5.98 (d, J=1.9 Hz, 1H), 5.07 (dd, J=5.3 and 12.5 Hz, 1H), 4.49 (d, J=6.0 Hz, 2H), 2.97-2.82 (m, 1H), 2.62-2.44 (m, 2H), 2.22 (s, 3H), 2.06-1.99 (m, 1H); 13C NMR (DMSO-d6) δ 172.77, 170.02, 168.77, 167.21, 151,04, 150.02, 145.80, 136.04, 132.08, 117.57, 110.96, 109.63, 108.27, 106.34, 48.55, 38.94, 30.95, 22.10, 13.24; Anal. Calcd. For C19H17N3O5: C, 62.12; H, 4.66; N, 11.44. Found: C, 61.75; H, 4.71; N, 11.15.
