Reaction Steps
To a suspension of 2-bromo-N-{2-[1-(3-ethoxy-4-methoxyphenyl)-2-(methylsulfonyl)ethyl]-1,3-dioxoisoindolin-4-yl}propanamide (500 mg, 0.9 mmol) in acetonitrile (5 mL) was added dimethylamine in methanol (1.5 mL, 2M, 3.0 mmol) at room temperature and the mixture was stirred for 2 days. The mixture was diluted with methylene chloride (50 mL) and sodium hydrogen carbonate (25 mL). The organic layer was separated, washed with brine (25 mL), and dried over magnesium sulfate. The solvent was removed in vacuo to give an oil. To a solution of the oil in ethyl acetate (20 mL) was added hydrogen chloride in ether (1.5 mL, 1N hydrogen chloride, 1.5 mmol). The resulting suspension was filtered and washed with ethyl acetate (10 mL) to give 2-(dimethylamino)-N-{2-[1-(3-ethoxy-4-methoxyphenyl)-2-(methylsulfonyl)ethyl]-1,3-dioxoisoindolin-4-yl}propanamide, hydrogen chloride as a white solid (290 mg, 58% yield): mp, 138-140° C.; 1H NMR (DMSO-d6) δ 1.32 (t, J=6.9 Hz, 3H, CH3), 1.56 (brs, 3H, CH3), 2.83 (brs, 6H, CH3), 3.01 (s, 3H, CH3), 3.73 (s, 3H, CH3), 4.02 (q, J=6.9 Hz, 2H, CH2), 4.15 (dd, J=4.4, 14.2 Hz, 1H, CHH), 4.27 (s, 1H, CH), 4.34 (dd, J=10.6, 14.3 Hz, 1H, CHH), 5.78 (dd, J=4.3, 10.3 Hz, 1H, NCH), 6.91-6.99 (m, 2H, Ar), 7.72 (d, J=7.1 Hz, 1H<Ar), 7.87 (d, J=7.5 Hz, 1H, Ar), 8.14 (m, 1H, Ar), 10.4 (brs, 1H, HCl), 10.71 (s, 1H, NH); 13C NMR (DMSO-d6) δ 13.42, 14.67, 41.07, 41.47, 47.31, 52.98, 55.51, 52.74, 63.84, 111.75, 112.31, 119.70, 120.16, 128.92, 129.47, 131.80, 134.05, 135.87, 147.87, 148.91, 166.66, 166.86, 167.65, 168.53; Anal Calcd for C25H31N3O7S+1.1HCl+0.6H2O: C, 52.82; H, 5.90; N, 7.39, Cl, 6.86, H2O, 1.90. Found: C, 52.57; H, 5.77; N, 7.10; Cl, 6.90; H2O, 1.47.
