[I:1][C:2]1[CH:11]=[CH:10][C:5]([C:6]([O:8][CH3:9])=[O:7])=[C:4]([S:12]([NH2:15])(=[O:14])=[O:13])[CH:3]=1.C([O-])([O-])=O.[K+].[K+].[CH2:22]([N:26]=[C:27]=[O:28])[CH2:23][CH2:24][CH3:25].Cl>ClC1C=CC=CC=1.O>[I:1][C:2]1[CH:11]=[CH:10][C:5]([C:6]([O:8][CH3:9])=[O:7])=[C:4]([S:12]([NH:15][C:27]([NH:26][CH2:22][CH2:23][CH2:24][CH3:25])=[O:28])(=[O:13])=[O:14])[CH:3]=134.1 g (0.1 mol) of the sulfonamide of the formula (IV) from Example 1 and 14.7 g of K2CO3 (0.105 mol) are admixed with 10.6 g of n-butyl isocyanate (98% pure) (0.105 mol) in 250 ml of chlorobenzene, and the mixture is kept at 55 to 60° C. for 2 hours. The mixture is then stirred at 90° C. for 8.5 h. The mixture is cooled to room temperature and initially 200 ml of water and then 2n of hydrochloric acid are added until the pH has reached 1-2. The organic phase is separated off and washed free of acid using four times 50 ml of water. The solvent is removed under reduced pressure, and 43.8 g of the desired compound of the formula (I) (99.3% of theory) of melting point 128 to 130° C. remain.
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