反应详情

To a solution of 2-(3,4-dichlorophenyl)-1-phenylethanone (Intermediate 6) (400 mg, 1.5 mmol), 3-ethoxy-4-hydroxy-5-nitrobenzaldehyde (317 mg, 1.5 mmol), and urea (207 mg, 4.5 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 (48-78% acetonitrile+0.1% trifluoroacetic acid in water, over 15 min.) and thin layer chromatography (PE:EtOAc=1:2) to give Compound 22 (17.8 mg, yield 2.4%). 1H NMR (CD3OD 400 MHz): δ 7.64 (s, 1H), 7.35-7.31 (m, 5H), 7.23-7.19 (m, 2H), 7.03 (s, 1H), 6.79 (d, J=8.0 Hz, 1H), 5.37 (s, 1H), 4.12 (m, 2H), 1.43 (t, J=6.8 Hz, 3H); MS (ESI): m/z 500.2 [M+1]+.

1. temperatureat reflux for 4 days
2. customAfter the solvent was removed under reduced pressure
3. customthe residue was purified by HPLC (48-78% acetonitrile+0.1% trifluoroacetic acid in water, over 15 min.) and thin layer chromatography (PE:EtOAc=1:2)