| abstract |
PROCESS FOR PREPARING 3-ISOPROPIL-1H-2,1,3-BENZOTIADIAZIN-4 (3H) -ONA OR A SALT 2,2-DIOXIDE. One The invention relates to a process for the production of 2,2- 3-isopropyl-1H-2,1,3-benzothiadiazin-4 (3H) -one (I) dioxide or its salt The process is characterized in that anthranilic acid (II) isopropylamide is reacted simultaneously with sulfur trioxide or chlorosulfonic acid in the presence of an organic base, or with sulfur trioxide adducts in organic bases, and phosphoroxychloride at 50 ° C until reflux temperature, and then optionally converted into its salts. |