Water → Diallyl 2-(4-cyanobutyl)-2-[2-(4-methoxycarbonylphenyl)ethyl]malonate

Participants

Reaction Conditions

Reaction Steps

5.62 g (140 mmol; 60% content) of sodium hydride are added in portions to a solution of 48.64 g (127.73 mmol) of diallyl 2-(4-cyanobutyl)malonate from Example 90A in 160 ml of dry DMF at 0° C. The reaction solution is then allowed to reach room temperature and is stirred for 90 min. The reaction solution is then cooled to 0° C. again and, after addition of 45.72 g (153.3 mmol) of methyl 4-(2-bromoethyl)benzoate in 80 ml of dry DMF, stirred at this temperature for 45 min. The mixture is then stirred at room temperature overnight. The reaction mixture is mixed with water and extracted with ethyl acetate. After phase separation, the aqueous phase is extracted three times with 200 ml of ethyl acetate each time. The combined organic phases is washed with saturated sodium chloride solution and dried over sodium sulfate, and then the solvent is stripped off in vacuo. The resulting crude product is purified by silica gel chromatography (mobile phase: cyclohexane/ethyl acetate 10:1→100% ethyl acetate). 18.53 g (43.3 mmol, 34% yield) of a colorless liquid are obtained.

Provenance & Evidence