METHOD FOR THE PREPARATION OF 3-ISOPROPPYL-1H-2,1,3-BENZOTHIADIAZIN-4(3H)-ON-2,2-DIOXIDE

摘要

The invention relates to a method for the preparation of the compound given above in the title or its salt with the formula By the method isopropylamide of the anthranylic acid with the formula reacts simultaneously with sulpur trioxide or chlorsulphonic acid in the presence of an organic base, or with adducts of sulphur trioxide and organic bases and with phosphorus oxychloride at temperatures ranging from 50 deg.C to the boiling temperature under influx. Then optionally the product can be converted into its salt. 10 claims