反应详情

温度

-60 °C

A solution of oxalylchloride (2.65 mL, 3.92 g, 30.9 mmol) in dichloromethane (50 mL) was cooled to −60° C. and DMSO (4.4 mL, 4.82 g, 4.4 mL) was added while maintaining the temperature between −50 and −60° C. A solution of 3-methyl-1-(pyrazin-2-yl)butan-1-ol (4.66 g, 28.0 mmol) in dichloromethane (10 mL) was added and the mixture was stirred for 15 min at −60° C. Triethylamine (19.45 mL, 14.17 g, 140 mmol) was added (T≈−55° C.) and the mixture was allowed to reach room temperature. Water was added and the aqueous phase was extracted with dichloromethane. The combined organic layers were dried over MgSO4 and concentrated in vacuo. Column chromatography (silica, EtOAc/Heptane 1/9) afforded 3-methyl-1-(pyrazin-2-yl)butan-1-one as a dark yellow oil (4.3 g; 94%).

1. temperaturewhile maintaining the temperature between −50 and −60° C
2. customto reach room temperature
3. extractionthe aqueous phase was extracted with dichloromethane
4. dry with materialThe combined organic layers were dried over MgSO4
5. concentrationconcentrated in vacuo