反应详情

Following the procedure for pyrimidinetrione formation outlined in Example 1, reaction of 1-[6-(4-[1,3,4]oxadiazol-2-yl-phenoxy)-pyridin-3-yl]-5-oxo-pyrrolidine-2,2-dicarboxylic acid diethyl ester (200 mg, 0.44 mmol) with urea (0.080 g, 1.3 mmol) in 1.3 mL of 1M sodium ethoxide in ethanol afforded 25 mg of 1-[6-(4-[1,3,4]oxadiazol-2-yl-phenoxy)-pyridin-3-yl]-1,7,9-triaza-spiro[4,5]decane-2,6,8,10-tetraone as a colorless solid. 1H NMR (CD3OD, 500 MHz): 9.02 (s, 1H), 8.14 (d, 2H, J=8.0 Hz), 8.06 (d, 1H, J=2.0 Hz), 7.78 (dd, 1H, J=2.5, 9.0 Hz), 7.35 (d, 2H, J=9.0 Hz), 7.12 (d, 1H, J=9.0 Hz), 2.74 (m, 2H), 2.66 (m, 2H) ppm. MS (APCl, m/z): 435 [M+H]+.