反应详情

To a solution of ethyl 4-nitro-1H-pyrrole-2-carboxylate (884 mg, 4.8 mmol) in DMF (11 ml) was added NaH (60% dispersion in mineral oil, 190 mg, 4.8 mmol) at 0° C. After 5 min the reaction mixture was added to a solution of 2-bromo-1-(4-methoxy-phenyl)-ethanone (1 g, 4.4 mmol) at 0° C. and the resultant mixture was allowed to warm to room temperature. After one hour the LCMS analysis showed the presence of the desired product and the complete consumption of the bromo-ketone stating material was confirmed by TLC (EtOAc/Hexanes 1:1). An aqueous solution of HCl (1 M) was then added until a white precipitate appeared. Water was added and the white solid filtrated, rinsed with water and dried in vacuo to give ethyl 1-[2-(4-methoxyphenyl)-2-oxoethyl]-4-nitro-1H-pyrrole-2-carboxylate as a white solid (1.32 g, yield 83%). 1H-NMR (400 MHz, CDCl3): δ 1.29 (t, 3H, J 7.1 Hz), 3.90 (s, 3H), 4.22 (q, 2H, J 7.2 Hz), 5.77 (s, 2H), 6.98-7.20 (m, 2H), 7.50 (d, 1H, J 1.8 Hz), 7.63 (d, 1H, J 1.8 Hz), 7.95-8.00 (m, 2H).

1. customthe presence of the desired product and the complete consumption of the bromo-ketone stating material
2. additionAn aqueous solution of HCl (1 M) was then added until a white precipitate
3. additionWater was added
4. filtrationthe white solid filtrated
5. washrinsed with water
6. customdried in vacuo