反应详情

A mixture of 3-(3-methyl-benzyloxy)-phthalic acid (1.8 g, 6.4 mmol), alpha-amino-glutarimide hydrochloride (1.1 g, 6.8 mmol) in pyridine was refluxed overnight. The mixture was evaporated and the residue was purified by flash column chromatography (methanol/methylene chloride) to give 2-(2,6-dioxo-piperidin-3-yl)-4-(3-methyl-benzyloxy)-isoindole-1,3-dione as a white solid (1.2 g, 48% yield); HPLC: Waters Symmetry C18, 5 μm, 3.9×150 mm, 1 mL/min, 240 nm, 60/40 CH3CN/0.1% H3PO4, 3.16 min (99.9%); mp, 195-197° C.; 1H NMR (DMSO-d6) δ 2.00-2.07 (m, 1H, CHH), 2.33 (s, 3H, CH3), 2.54-2.62 (m, 2H, CH2), 2.83-2.95 (m, 1H, CHH), 5.10 (dd, J=6, 12 Hz, 1H, CH), 5.33 (s, 2H, CH2), 7.15-7.85 (m, 7H, Ar), 11.12 (s, 1H, NH); 13C NMR (DMSO-d6) δ 21.00, 21.96, 30.92, 48.74, 70.08, 115.49, 116.58, 120.19, 124.40, 127.85, 128.40, 128.60, 133.26, 136.03, 136.98, 137.64, 155.53, 165.30, 166.77, 169.91, 172.75. Anal Calcd For C21H18N2O5: C, 66.66; H, 4.79; N, 7.40. Found: C, 66.50; H, 4.79; N, 7.34.

1. temperaturewas refluxed overnight
2. customThe mixture was evaporated
3. customthe residue was purified by flash column chromatography (methanol/methylene chloride)