反应详情

9.86 Grams of methyl acetoacetate were dissolved in 15 ml of water, and 12.67 g of a 30% aqueous sodium hydroxide solution were added thereto by drops while cooling the mixture to 25° C. or less. After having been stirred at 30°-35° C. for 3 hours, the mixture was adjusted to pH 7.0 with a concentrated aqueous hydrochloric acid solution. Thereafter, 1.10 g of sodium butyrate and 2.42 g of tetrabutylammonium bromide were added thereto and then an additional concentrated aqueous hydrochloric acid solution was added to the mixture so that the mixture was adjusted to pH 6.8. Further, 29.45 g of a toluene solution containing 31.2% of 3-(4-bromophenylthio)propanal were added thereto and was stirred at 45°-50° C. for 9 hours. The organic layer separated from the mixture was washed with a 5% aqueous acetic acid solution and then with a saturated aqueous sodium chloride solution. Then the layer was dried over anhydrous magnesium sulfate. Removing the solvent from the layer under reduced pressure gave 14.54 g of crude 6-(4-bromophenylthio)-4-hydroxy-2-hexanone (purity: 81.8%, yield: 99.5%). A purified product was obtained by recrystallization from diisopropyl ether. The purified product had a melting point of 53.0-54.0° C.

1. temperatureby drops while cooling the mixture to 25° C. or less
2. additionwere added
3. stirringwas stirred at 45°-50° C. for 9 hours
4. customThe organic layer separated from the mixture
5. washwas washed with a 5% aqueous acetic acid solution
6. dry with materialThen the layer was dried over anhydrous magnesium sulfate
7. customRemoving the solvent from the layer under reduced pressure