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0 °C

2-Methylsulfonyl-N-(6-methyl-3-phenyl-1H-indazol-5-yl)benzenesulfonamide can be obtained in the following way: 0.45 g of 2-methylsulfonylbenzenesulfonyl chloride is added to a solution, at a temperature in the region of 0° C. and under argon, of 0.4 g of 5-amino-6-methyl-3-phenyl-1H-indazole in 35 ml of pyridine. The reaction mixture is then stirred for 10 minutes at a temperature in the region of 0° C. then 16 hours at a temperature in the region of 20° C., and is then diluted with 50 ml of water. After settling out, the aqueous phase is extracted with 50 ml and then 25 ml of ethyl acetate. The organic extracts are pooled, dried over magnesium sulfate, filtered and then concentrated to dryness under reduced pressure (2 kPa) at a temperature in the region of 40° C. The residue thus obtained is purified by chromatography on a silica column (particle size 63-200 μm), eluting with a dichloromethane/methanol (99/1 by volume) mixture. The fractions containing the expected product are pooled and concentrated to dryness under reduced pressure (2 kPa) at a temperature in the region of 40° C. The residue is taken up and recrystallized from 20 ml of diethyl ether. The crystals are filtered off through sintered glass, washed with 2 times 10 ml of diisopropyl ether, partially dried and then dried under reduced pressure (3 kPa) at a temperature in the region of 50° C. 0.27 g of 2-methylsulfonyl-N-(6-methyl-3-phenyl-1H-indazol-5-yl)benzenesulfonamide are obtained in the form of a beige powder melting at 239° C. (analysis C21H19N3O4S2 % calculated C, 57.13; H, 4.34; N, 9.52; O, 14.49; S, 14.52. % found C, 56.66; H, 4.52; N, 9.41; S, 14.15).

1. extractionthe aqueous phase is extracted with 50 ml
2. dry with materialdried over magnesium sulfate
3. filtrationfiltered
4. concentrationconcentrated to dryness under reduced pressure (2 kPa) at a temperature in the region of 40° C
5. customThe residue thus obtained
6. customis purified by chromatography on a silica column (particle size 63-200 μm)
7. washeluting with a dichloromethane/methanol (99/1 by volume) mixture
8. additionThe fractions containing the expected product
9. concentrationconcentrated to dryness under reduced pressure (2 kPa) at a temperature in the region of 40° C
10. customrecrystallized from 20 ml of diethyl ether
11. filtrationThe crystals are filtered off through sintered glass
12. washwashed with 2 times 10 ml of diisopropyl ether
13. custompartially dried
14. customdried under reduced pressure (3 kPa) at a temperature in the region of 50° C