反应详情

Ethyl chloroformate (3 eq) was added slowly to a cooled (0° C.) solution of 1-(2,4-dihydroxy-phenyl)-2-methyl-propan-1-one (1 eq) and triethylamine (3 eq) in THF. The mixture was warmed to ambient temperature and stirred for three hours before being filtered and the solids washed with cold THF. The combined filtrates were cooled to 0° C. and sodium borohydride (4 eq) in a volume of water equal to the THF filtrates added slowly. The mixture was warmed to ambient temperature, stirred for three hours and diluted with water. The mixture was twice extracted with diethyl ether, the combined extracts concentrated to dryness and re-suspended in 10% aqueous sodium hydroxide solution (4 eq). After refluxing for 90 minutes, the mixture was cooled, acidified with 5M aq HCl and twice extracted with diethyl ether. The organic extracts were dired over magnesium sulphate, filtered and concentrated to dryness to give 4-isobutyl-benzene-1,3-diol as a cloudy oil, which was used without further purification.

1. filtrationbefore being filtered
2. washthe solids washed with cold THF
3. temperatureThe combined filtrates were cooled to 0° C.
4. temperatureThe mixture was warmed to ambient temperature
5. stirringstirred for three hours
6. extractionThe mixture was twice extracted with diethyl ether
7. concentrationthe combined extracts concentrated to dryness
8. temperatureAfter refluxing for 90 minutes
9. temperaturethe mixture was cooled
10. extractiontwice extracted with diethyl ether
11. filtrationfiltered
12. concentrationconcentrated to dryness