Ethyl bromoacetate → 1-Ethoxycarbonyl-5-chloro-3-phenylisoindole-2-acetic acid ethyl ester

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Reaction Steps

A solution of 30.0 g. of 5-chloro-3-phenyisoindole-1carboxylic acid ethyl ester in 300 ml. of dimethylsulfoxide is treated with 66.8 g. of bromoacetic acid ethyl ester and 27.6 g. of finely triturated, dry potassium carbonate and intensively stirred at room temperature for 17 hours. The mixture is poured into 750 ml. of ice-water and the separated product, after the addition of 50 g. of sodium chloride, is removed by filtration under suction, washed with water and then dissolved in methylene chloride. The aqueous layer is separated, the organic phase dried over sodium sulfate, filtered and concentrated to dryness. The resulting oil crystallizes on trituration with ether and pentane, and there is obtained 1-ethoxycarbonyl-5-chloro-3-phenylisoindole-2-acetic acid ethyl ester; melting point 100°-101° C. Recrystallization from ethanol increases the melting point to 103°-104° C.

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