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429 g of methanol were introduced into a balloon flask provided with a condenser and then, under cooling, 54 g of 93% sulfuric acid and 111 g of 7-sulfamoyl-1,4-benzodioxane-5-carboxylic acid were added. The mixture was heated under reflux and then cooled. The crystals were dried off, washed with methanol and then treated with 500 cm3 of water and 5 g of sodium carbonate. The precipitate was dried off, washed with water and dried. 95 g of methyl-7-sulfamoyl-1,4-benzodioxane-5-carboxylate were obtained (M.P.: 225°-226° C.; yield: 81%).

1. customprovided with a condenser
2. temperatureunder cooling
3. temperatureThe mixture was heated
4. temperatureunder reflux
5. temperaturecooled
6. customThe crystals were dried off
7. washwashed with methanol
8. additiontreated with 500 cm3 of water and 5 g of sodium carbonate
9. customThe precipitate was dried off
10. washwashed with water
11. customdried