反应详情

温度

-20 °C

0.8 g of N-methylpiperidine was added to a solution containing 2.0 g of N-cyclohexyloxycarbonyl-L-valine dissolved in 150 ml of methylene chloride, at -20° C. After the mixture was stirred for 10 minutes at the same temperature, 1.1 g of isobutyl chloroformate was added to the mixture, and stirred for 1 hour at -20° C. 1.5 g of 2-(4-cyanophenoxy)-1-methylethylamine was added to this mixture at -60° C., and then the reaction mixture was allowed to sit and warm naturally to room temperature while being stirred, and was stirred for 20 hours at room temperature. Water was subsequently added to the reaction mixture. After the methylene chloride layer was washed successively with a 5% aqueous solution of sodium bicarbonate and water, the organic layer was dried over anhydrous magnesium sulfate and the methylene chloride was removed under reduced pressure. The residue was purified by column chromatography on silica gel, thus obtaining 0.5 g of the desired product in the form of light brown powder (yield: 16%).

1. additionwas added to the mixture
2. temperaturewarm naturally to room temperature
3. stirringwhile being stirred
4. stirringwas stirred for 20 hours at room temperature
5. washAfter the methylene chloride layer was washed successively with a 5% aqueous solution of sodium bicarbonate and water
6. dry with materialthe organic layer was dried over anhydrous magnesium sulfate
7. customthe methylene chloride was removed under reduced pressure
8. customThe residue was purified by column chromatography on silica gel