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7-Fluoro-3-(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-1,3-dihydro-2H-indol-2-one (1.20 g) and 1-methyl-1H-imidazole (0.97 g) are introduced as initial charge in 10 ml of dichloromethane and cooled to 0° C. under nitrogen. With stirring, difluoromethanesulfonyl chloride (1.21 g) is added in 2 portions and the mixture is warmed to room temperature. After 5 hours, 1-methyl-1H-imidazole (0.32 g) and difluoromethanesulfonyl chloride (0.61 g) are added and the mixture is stirred for 16 hours. After adding water and some hydrochloric acid, the solid is filtered off, washed with dichloromethane and water and dried. This gives the title compound as a solid in an HPLC purity of 91% (1.54 g, 92% of theory). The UV absorption (maximum at 360 nm) verifies the N-sulfonylation of the product.

1. temperaturethe mixture is warmed to room temperature
2. stirringthe mixture is stirred for 16 hours
3. filtrationsome hydrochloric acid, the solid is filtered off
4. washwashed with dichloromethane and water
5. customdried