反应详情

温度

0 °C

To a solution of 5-bromo-1-methylpyrazin-2-one (500.0 mg, 2.65 mmol) and (p-tolylsulfonyl)methyl isocyanide (573.0 mg, 2.94 mmol) in THF (4 mL) was added a suspension of NaH (235.0 mg, 5.9 mmol) in THF (2 mL) at 0° C. under N2. After stirring at 0° C. for 30 min, the mixture was stirred at 30° C. for another 1.5 h. The reaction mixture was quenched with H2O (20 mL) at 0° C., and extracted with EtOAc (30 mL×2). The organic phases were combined, washed with brine (30 mL), dried over Na2SO4, filtered and evaporated. The crude product was purified by column chromatography (PE:EA=1/1) to give the title compound (300.0 mg, 50%) as a light yellow solid. 1H NMR (CDCl3 400 MHz) δ 8.06 (d, J=4.4 Hz, 1H), 6.61 (s, 1H), 3.48 (s, 3H). LCMS (M+H)+ 228.

1. stirringthe mixture was stirred at 30° C. for another 1.5 h
2. customThe reaction mixture was quenched with H2O (20 mL) at 0° C.
3. extractionextracted with EtOAc (30 mL×2)
4. washwashed with brine (30 mL)
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. customevaporated
8. customThe crude product was purified by column chromatography (PE:EA=1/1)