反应详情

温度

100 °C

To a solution of (E)-ethyl 3-phenyl-3-(pyridazin-4-yl)acrylate (1.8 g, 7.09 mmol) in PhMe (40 mL), TsNHNH2 (2.64 g, 14.2 mmol) and Et3N (2.15 g, 21.3 mmol) was added, the resulting mixture was heated to 100° C. overnight. The reaction was detected by TLC, TLC showed the appearance of desired product, then, the solvent was removed under reduced pressure, H2O was added and extracted with AcOEt (3×50 ml), the combined organic layers were washed by brine, dried over Na2SO4 and concentrated to get the crude product, which was purified by column chromatography on silica gel (Petroleum Ether: EtOAc=3:2) to afford ethyl 3-phenyl-3-(pyridazin-4-yl)propanoate (1.20 g, yield: 66%). 1H NMR (CDCl3 400 MHz):δ9.12 (d, J=2.0 Hz, 1H), 9.09 (d, J=6.8 Hz, 1H), 7.40-7.24 (m, 4H), 7.20 (d, J=7.2 Hz, 2H), 4.56 (t, J=8.0 Hz, 1H), 4.08 (q, J=7.2 Hz, 2H), 3.09 (d, J=8.0 Hz, 2H), 1.15 (t, J=7.2 Hz, 3H).