反应详情

温度

60 °C

A solution of 168 mg of 3-hydroxybenzaldehyde dimethyl acetal in 10 ml of anyhydrous dimethylformamide was stirred under nitrogen and 220 mg of potassium tert-butoxide were added. The mixture was heated at 60° C. for 1 hour, then cooled to room temperature and 115 mg of 2-chloropyrazine were added in portions. The mixture was then heated at 160° C. for 18 hours. After cooling 15 ml of water were added and the product was extracted with 50 ml of ethyl acetate. The extract was washed with 25 ml of 1M sodium hydroxide solution and 25 ml of brine and then dried over anhydrous magnesium sulphate. After filtration and evaporation of the filtrate the residual yellow oil was purified by column chromatography on silica gel using ethyl acetate/hexane (1:1) for the elution to give 3-(2-pyrazinyloxy)-benzaldehyde dimethyl acetal as a yellow oil.

1. temperaturecooled to room temperature
2. temperatureThe mixture was then heated at 160° C. for 18 hours
3. additionwere added
4. extractionthe product was extracted with 50 ml of ethyl acetate
5. washThe extract was washed with 25 ml of 1M sodium hydroxide solution and 25 ml of brine
6. dry with materialdried over anhydrous magnesium sulphate
7. filtrationAfter filtration and evaporation of the filtrate the residual yellow oil
8. customwas purified by column chromatography on silica gel
9. washfor the elution