反应详情

To a solution of 2-(4-bromophenyl)-1-phenylethanone (Intermediate 8) (140 mg, 0.5 mmol), 3-ethoxy-4-hydroxy-5-nitrobenzaldehyde (108 mg, 0.5 mmol), and urea (69 mg, 1.5 mmol) in 20 mL of ethanol was added 0.2 mL of concentrated HCl, the mixture was stirred at reflux for 3 days. After the solvent was removed under reduced pressure, the residue was purified by HPLC (46-76% acetonitrile+0.1% trifluoroacetic acid in water, over 15 min.) to give Compound 25 (43 mg, yield 16.5%). 1H NMR (CD3OD 400 MHz): δ 7.52 (s, 1H), 7.20-7.17 (m, 5H), 7.11-7.08 (m, 3H), 6.69 (d, J=8.4 Hz, 2H), 5.23 (s, 1H), 3.40-3.95 (m, 2H), 1.30 (t, J=6.8 Hz, 3H); MS (ESI): m/z 510.2 [M+1]+.

1. temperatureat reflux for 3 days
2. customAfter the solvent was removed under reduced pressure
3. customthe residue was purified by HPLC (46-76% acetonitrile+0.1% trifluoroacetic acid in water, over 15 min.)