反应详情

To a suspension of crude 1-[2-(4-bromophenyl)-2-oxoethyl]-1H-pyrrole-2-carboxylic acid (1.1 g, 0.714 mmol) suspended in xylenes (50 mL) was added ethane-1,2-diamine (0.5 mL, 7.5 mmol). The orange reaction mixture was heated at reflux for 1 h. The reaction mixture was concentrated in vacuo to give a dark orange oil that was purified using flash chromatography (Biotage SP4, 40 g cartridge, 0-10% MeOH gradient in EtOAc) to give 10a-(4-bromophenyl)-2,3,10,10a-tetrahydro-1H,5H-imidazo[1,2-a]pyrrolo[1,2-d]pyrazin-5-one as a pale yellow solid (216 mg, 90% yield). 1H NMR (400 MHz, d6-acetone): δ 2.71-2.84 (m, 1H), 3.30-3.38 (m, 1H), 3.42 (ddd, 1H, J 11.0, 7.7, 3.2 Hz), 3.70 (dt, 1H, J 10.8, 7.8 Hz), 4.36 (d, 1H, J 12.3 Hz), 4.65 (d, 1H, J 12.3 Hz), 6.03 (dd, 1H, J 3.7, 2.6 Hz), 6.66 (m, 2H), 7.29-7.33 (m, 2H), 7.45-7.49 (m, 2H).

1. temperatureThe orange reaction mixture was heated
2. temperatureat reflux for 1 h
3. concentrationThe reaction mixture was concentrated in vacuo
4. customto give a dark orange oil that
5. customwas purified