82 g of dextrorotatory 1-ethyl-2-aminomethylpyrrolidine, 600 ccm of chloroform and, gradually, at a temperature of from 5°-10° C., 200 g of 7-methylsulfamoyl-1,4-benzodioxane-5-carbonyl chloride were introduced into a balloon flask with an agitator and a thermometer. After the addition of a liter of water chloroform was distilled and then the remaining solution was filtered. The base was precipitated by the addition of 60 cm3 of 20% ammonia. The crystals formed were dried off, washed with water and then dried. 162 g of dextrorotatory N-(1-ethyl-2-pyrrolidylmethyl)-7-methylsulfamoyl-1,4-benzodioxane-5-carboxamide was produced (M.P.: 136°-137° C.; yield: 66%).
