反应详情

To a solution of 2-(4-methoxyphenyl)-1-phenylethanone (100 mg, 0.44 mmol), 3-ethoxy-4-hydroxy-5-nitrobenzaldehyde (93 mg, 0.44 mmol), and urea (60 mg, 1.32 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 thin layer chromatography (PE:EtOAc=1:2) to give Compound 19 (22 mg, yield 10.8%). 1H NMR (CD3OD 400 MHz): δ 7.55 (s, 1H), 7.20 (s, 5H), 7.12 (s, 1H), 6.73 (d, J=8.4 Hz, 2H), 6.57 (d, J=8.8 Hz, 2H), 5.25 (s, 1H), 4.05-4.00 (m, 2H), 3.61 (s, 3H), 1.35 (t, J=6.8 Hz, 3H); MS (ESI): m/z 462.2 [M+1]+.

1. temperatureat reflux for 4 days
2. customAfter the solvent was removed under reduced pressure
3. customthe residue was purified by thin layer chromatography (PE:EtOAc=1:2)