[N:1]([CH2:4][C:5]([O:7][CH2:8][CH3:9])=[O:6])=[C:2]=[O:3].Cl.O1CCOCC1.[CH3:17][C:18]([OH:23])([CH2:21][CH3:22])[CH2:19][CH3:20]>ClCCl>[CH2:19]([C:18]([CH3:17])([O:23][C:2]([NH:1][CH2:4][C:5]([O:7][CH2:8][CH3:9])=[O:6])=[O:3])[CH2:21][CH3:22])[CH3:20]0.500 ml (4.01 mmol) of ethyl isocyanatoacetate was dissolved in dichloromethane. 0.05 ml of 4 N hydrochloric acid/1,4-dioxane solution was added to the obtained solution, and they were stirred at room temperature for 5 minutes. 0.547 ml (4.41 mmol) of 3-methyl-3-pentanol was added to the reaction mixture, and they were stirred overnight. After the concentration under reduced pressure, ethyl acetate was added to the reaction mixture, and they were washed with saturated aqueous sodium hydrogencarbonate solution, dried over anhydrous sodium sulfate and then concentrated under reduced pressure. The residue was washed with diethyl ether. The filtrate was concentrated under reduced pressure to obtain the title compound.
Wird geladen…