反应详情

温度

60 °C

To a solution of ethyl 6-methyl-4-(2-nitrophenyl)-2-(thiazol-2-yl)-1,4-dihydropyrimidine-5-carboxylate (7.45 g, 20 mmol) in carbon tetrachloride (100 mL) was added NBS (3.74 g, 21 mmol) under N2 at 60° C. The mixture was stirred at 60° C. for 10 minutes, and cooled to 25° C. The resulting mixture was filtered and the filtrate was concentrated in vacuo. The residue was purified by a silica gel column chromatography (PETROLEUM ETHER/EtOAc (V/V)=3/1) to give the title compound as a yellow solid (6.32 g, 70%). The compound was characterized by the following spectroscopic data:

1. temperaturecooled to 25° C
2. filtrationThe resulting mixture was filtered
3. concentrationthe filtrate was concentrated in vacuo
4. customThe residue was purified by a silica gel column chromatography (PETROLEUM ETHER/EtOAc (V/V)=3/1)