反应详情

In 10 ml of acetic acid was dissolved 1.35 g of 6-(3,5-di-tert-butyl-4-hydroxyphenyl)-2,3-dihydroimidazo[2,1-b]thiazole and after adding thereto 0.64 g of sodium thiocyanate, 0.7 g of bromine was added dropwise to the solution under ice-cooling. After performing the reaction for one hour at room temperature, 30 ml of water was added to the reaction mixture to precipitate crystals, which were recovered by filtration. The crystals were added to a mixture of 20 ml of chloroform and 10 ml of an aqueous 10% potassium carbonate solution followed by stirring. The chloroform layer thus formed was dried and concentrated, and the residue thus formed was purified by silica gel column chromatography using chloroform as the eluent and further recrystallized from ethanol to provide 0.6 g 6-(3,5-di-tert-butyl-4-hydroxyphenyl)-5-thiocyanato-2,3-dihydroimidazo[2,1-b]thiazole.

1. additionafter adding
2. temperaturecooling
3. customthe reaction for one hour at room temperature
4. customto precipitate crystals, which
5. filtrationwere recovered by filtration
6. additionThe crystals were added to a mixture of 20 ml of chloroform and 10 ml of an aqueous 10% potassium carbonate solution
7. customThe chloroform layer thus formed
8. customwas dried
9. concentrationconcentrated
10. customthe residue thus formed
11. customwas purified by silica gel column chromatography
12. customfurther recrystallized from ethanol