反应详情

To a solution of 1-phenyl-2-m-tolylethanone (Intermediate 4) (460 mg, 2.18 mmol), 3-ethoxy-4-hydroxy-5-nitrobenzaldehyde (460 mg, 2.18 mmol) and urea (300 mg, 6.54 mmol) in 20 mL of ethanol was added 0.2 mL of concentrated HCl, the mixture was stirred at reflux for 4 days. After the solvent was removed under reduced pressure, the residue was purified by HPLC (38-68% acetonitrile+0.1% trifluoroacetic acid in water, over 15 min.) and thin layer chromatography (PE:EtOAc=1:2) to give Compound 17 (25 mg, yield 2.6%). 1H NMR (CD3OD 400 MHz): δ 7.62 (s, 1H), 7.27 (s, 5H), 7.18 (d, J=1.6 Hz, 1H), 6.95 (t, J=7.6 Hz, 1H), 6.88 (d, J=7.6 Hz, 1H), 6.74 (s, 1H), 6.67 (d, J=7.6 Hz, 1H), 5.36 (s, 1H), 4.07 (m, 2H), 2.10 (s, 3H), 1.41 (t, J=6.8 Hz, 3H); MS (ESI): m/z 446.2 [M+1]+.

1. temperatureat reflux for 4 days
2. customAfter the solvent was removed under reduced pressure
3. customthe residue was purified by HPLC (38-68% acetonitrile+0.1% trifluoroacetic acid in water, over 15 min.) and thin layer chromatography (PE:EtOAc=1:2)