反应详情

A solution of 4.20 g. of 3,4-dihydroxybenzoic acid methyl ester in 10.0 ml. of methanol is combined with 7.0 g. of sodium methoxide and then 15.0 g. of 1,2-dibromoethane is added. The resulting mixture is refluxed under nitrogen for 24 hours, then cooled, filtered, evaporated in vacuo and the resulting oil dissolved in 50 ml. of chloroform. The resulting solution after again filtering is chromatographed over 100 ml. of silica gel eluting with chloroform to obtain 3,4-ethylenedioxybenzoic acid methyl ester, m.p. 43°-45° C.

1. temperatureThe resulting mixture is refluxed under nitrogen for 24 hours
2. temperaturecooled
3. filtrationfiltered
4. customevaporated in vacuo
5. dissolutionthe resulting oil dissolved in 50 ml
6. filtrationThe resulting solution after again filtering
7. customis chromatographed over 100 ml