반응 단계
To a suspension of 4-aminomethyl-2-(2,6-dioxo-piperidin-3-yl)-isoindole-1,3-dione hydrochloride (0.57 g, 1.75 mmol) in CH3CN (10 ml), were added triethyl amine (0.61 mL, 4.4 mmol) and 1,3-thiazole-2-carbonyl-chloride (1.07 g, 4.5 mmol). The mixture was stirred at room temperature overnight and a suspension was obtained. The reaction mixture was filtered, and the filtrate was concentrated in vacuo. The resulting oil was purified by ISCO silica gel flash chromatography (eluent: 3% MeOH in CH2Cl2) to afford thiazole-2-carboxylic acid [2-(2,6-dioxo-piperidin-3-yl)-1,3-dioxo-2,3-dihydro-1H-isoindol-4-ylmethyl]-amide as a white solid (0.52 g, 74%): mp, 189-191° C.; HPLC: Waters Symmetry C-18, 3.9×150 mm, 5 micro, 1 mL/min, 240 nm, gradient from 10/90 (CH3CN/H2O) to 95/5(CH3CN/H2O) in 10 minutes: tR=5.9 min (97%); 1H NMR (DMSO-d6): δ 2.05-2.12 (m, 1H), 2.53-2.65 (m, 2H), 2.86-2.98 (m, 1H), 4.94 (d, J=6.2 Hz, 2H), 5.18 (dd, J=5, 11 Hz, 1H), 7.68-8.10 (m, 5H), 9.50 (t, J=6 Hz, 1H), 11.15 (s, 1H). 13C NMR (DMSO-d6) δ: 21.96, 30.92, 38.32, 48.88, 121.98, 125.99, 127.17, 131.56, 132.92, 134.85, 138.43, 143.98, 159.59, 163.18, 166.93, 167.51, 169.81, 172.73. Anal Calcd for C18H14N4O5S: C, 54.27; H, 3.54; N, 14.06; S, 8.05. Found: C, 53.98; H, 3.49; N, 13.75; S, 8.22.
