反应详情

To a solution of methyl 5-bromo-1-[2-(4-methoxyphenyl)-2-oxoethyl]-1H-pyrrole-2-carboxylate (250 mg, 0.71 mmol) in 1,4-dioxane (50 mL) was added ethane-1,2-diamine (1.0 mL, 15 mmol). The solution was heated at reflux one week. During that time a batch of ethane-1,2-diamine (1.5 mL, 22 mmol) was added. The mixture was concentrated in vacuo to give a oil that was partitioned between water (30 mL) and CH2Cl2 (30 mL). The aqueous layer was further extracted with CH2Cl2 (2×30 mL). The organic layers were dried (MgSO4), filtered and concentrated in vacuo to give a oil that was purified by flash chromatography (Biotage SP4, 12 g cartridge, gradient 0-10% methanol in CH2Cl2) to give 8-bromo-10a-(4-methoxyphenyl)-2,3,10,10a-tetrahydro-1H,5H-imidazo[1,2-a]pyrrolo[1,2-d]pyrazin-5-one as a pale yellow solid (135 mg, yield 52%). ESI-MI m/z calculated [M+H]+ 364.0.

1. temperatureThe solution was heated
2. temperatureat reflux one week
3. concentrationThe mixture was concentrated in vacuo
4. customto give a oil that
5. customwas partitioned between water (30 mL) and CH2Cl2 (30 mL)
6. extractionThe aqueous layer was further extracted with CH2Cl2 (2×30 mL)
7. dry with materialThe organic layers were dried (MgSO4)
8. filtrationfiltered
9. concentrationconcentrated in vacuo
10. customto give a oil that
11. customwas purified by flash chromatography (Biotage SP4, 12 g cartridge, gradient 0-10% methanol in CH2Cl2)