Reaction Steps
To a stirred mixture of 3-(5-aminomethyl-1-oxo-1,3-dihydro-isoindol-2-yl)-piperidine-2,6-dione methane sulfonate (0.37 g, 1.00 mmol) and 3,4-dimethylphenylisocyanate (0.15 g, 1.00 mmol) in acetonitrile (10 mL), was added triethylamine (0.28 mL, 2.00 mmol) at room temperature under nitrogen. After 1 h, 1N aq. HCl (20 mL) was added and the mixture was stirred for 10 min. The product was isolated by filtration, washed with 1N aq. HCl (20 mL), acetonitrile (20 mL) and dried overnight in vacuo to give 1-(3,4-dimethyl-phenyl)-3-[2-(2,6-dioxo-piperidin-3-yl)-1-oxo-2,3-dihydro-1H-isoindol-5-ylmethyl]-urea as a white solid (0.30 g, 71% yield): HPLC: Waters Symmetry C18, 5 μm, 3.9×150 mm, 1 mL/min, 240 nm, 40/60 CH3CN/0.1% H3PO4, 3.02 min (97.86%); mp: 254-256° C.; 1H NMR (DMSO-d6) δ 1.93-2.06 (m, 1H), 2.12 (s, 3H), 2.15 (s, 3H), 2.30-2.47 (m, 1H), 2.60 (d, J=17.2 Hz, 1H), 2.82-3.00 (m, 1H), 4.31 (d, J=17.4 Hz, 1H), 4.36-4.50 (m, 3H), 5.11 (dd, J=5.0, 13.3 Hz, 1H), 6.66 (t, J=5.9 Hz, 1H), 6.96 (d, J=8.3 Hz, 1H), 7.11 (dd, J=1.7, 8.1 Hz, 1H), 7.18 (s, 1H), 7.44 (d, J=7.9 Hz, 1H), 7.51 (s, 1H), 7.69 (d, J=7.7 Hz, 1H), 8.41 (s, 1H), 10.98 (s, 1H); 13C NMR (DMSO-d6) δ 18.60, 19.62, 22.49, 31.20, 42.77, 47.10, 51.56, 115.35, 119.15, 121.86, 122.91, 126.89, 128.67, 129.49, 130.26, 136.08, 138.03, 142.36, 144.96, 155.26, 167.95, 170.98, 172.85; Anal Calcd for C23H24N4O4: C, 65.70; H, 5.75; N, 13.33. Found: C, 65.48; H, 5.62; N, 13.20.
