[CH3:1][O:2][C:3]1[N:8]=[C:7]([O:9][CH3:10])[N:6]=[C:5]([CH:11]2[C:19]3[C:14](=[CH:15][CH:16]=[CH:17][CH:18]=3)[NH:13][C:12]2=[O:20])[N:4]=1.CN1C=CN=C1.[F:27][CH:28]([F:33])[S:29](Cl)(=[O:31])=[O:30].O>ClCCl>[F:27][CH:28]([F:33])[S:29]([N:13]1[C:14]2[C:19](=[CH:18][CH:17]=[CH:16][CH:15]=2)[CH:11]([C:5]2[N:4]=[C:3]([O:2][CH3:1])[N:8]=[C:7]([O:9][CH3:10])[N:6]=2)[C:12]1=[O:20])(=[O:31])=[O:30]3-(4,6-Dimethoxy-1,3,5-triazin-2-yl)-1,3-dihydro-2H-indol-2-one (10 g) and 1-methyl-1H-imidazole (5.4 g) are introduced as initial charge in 100 ml of dichloromethane and cooled to −5° C. under nitrogen. With stirring, difluoromethanesulfonyl chloride (7.03 g) is added dropwise at −5° C. to 0° C. over the course of 20 minutes, and the mixture is after-stirred at this temperature for 2.5 hours. The reaction mixture is admixed with 50 ml of water and mixed thoroughly. The organic solvent is largely distilled off in vacuo and the residue is filtered. The solid product is washed with water and acetonitrile and dried in a vacuum drying cabinet. This gives the title compound as a solid in an HPLC purity of 93% (12.5 g, 92% of theory). The UV absorption (maximum at 360 nm) verifies the N-sulfonylation of the product.
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