反应详情

To a stirred mixture of 3-methoxy-4-[N′-(2-methylphenyl)ureido]phenylacetic acid (1.30 g, 4.136 mmol), Et3 N (0.63 mL, 4.549 mmol) in DMF (20 mL) was added pentafluorophenyl trifluoroacetate at 0° C. The resulting mixture was stirred at room temp for 1 hr. The mixture was poured into water (60 mL) and precipitate was collected with suction. The crude solid was washed with 0.1 N HCl, H2O, n-hexane, and dried at 40° C. to afford 1.91 g (96%) pentafluorophenyl 3-methoxy-4-[N′-(2-methylphenyl) ureido]phenylacetate as a pale brownish crystalline powder. IR (KBr) 1785, 1224, 1216 cm−1; 1H-NMR (400 MHz, CDCl3) δ 2.29 (s, 3H), 3.76 (s, 3H), 3.90 (s, 2H), 6.49 (s, 1H), 6.81 (d, J=1.5 Hz, 1H), 6.91 (dd, J=1.5, 8.3 Hz, 1H), 7.15 (t, J=7.3 Hz, 3H), 7.24 (m, 1H), 7.50 (d, J=7.8 Hz, 1H), 8.17 (d, J=7.8 Hz, 1H); MS (FAB) m/z 481 (M++1); Anal. Calcd for C30H33N3O5S.1/4H2O: C, 57.51; H, 3.57; N, 5.83. Found: C, 57.40; H, 3.75; N, 5:68.

1. customwas collected with suction
2. washThe crude solid was washed with 0.1 N HCl, H2O, n-hexane
3. customdried at 40° C.