反应详情

13.1 g methyl 3-(3-methoxy-4-hydroxyphenyl)propionate (62.4 mmol) is dissolved in 150 ml dry N,N-dimethylformamide (DMF). After addition of 4.0 g 88% KOH (62.7 mmol) to this solution, the whole is stirred for 30 minutes, after which 7.55 g allyl bromide (62.4 mmol) in 120 ml dry DMF is added dropwise over a 30-minute period. After stirring for 11/2 hours at room temperature, the reaction mixture is poured out into 1700 ml saturated NaCl solution. Extraction with ethyl acetate, evaporation to dryness and chromatography on 150 g silica gel with tolueneethyl acetate (95:5) as eluent gives 12.4 g methyl 3-(3-methoxy-4-allyloxyphenyl)propionate as an oil. Rf in toluene:ethyl-acetate (85.15)=0.5 on SiO2.

1. stirringAfter stirring for 11/2 hours at room temperature
2. extractionExtraction
3. customwith ethyl acetate, evaporation to dryness and chromatography on 150 g silica gel with tolueneethyl acetate (95:5) as eluent