S(S([O-])=O)([O-])=O.[Na+].[Na+].[N+:9]([C:12]1[C:13]([NH:22][S:23]([CH2:26][CH3:27])(=[O:25])=[O:24])=[N:14][CH:15]=[C:16]([C:18]([F:21])([F:20])[F:19])[CH:17]=1)([O-])=O.[Cl-].[Na+]>O.O1CCCC1>[NH2:9][C:12]1[C:13]([NH:22][S:23]([CH2:26][CH3:27])(=[O:25])=[O:24])=[N:14][CH:15]=[C:16]([C:18]([F:21])([F:19])[F:20])[CH:17]=1An alternative process will be described. To a solution prepared by dissolving 34.9 g of sodium hydrosulfite in 400 ml of water, a solution prepared by dissolving 5.0 g of N-(3-nitro-5-trifluoromethyl-2-pyridyl)ethanesulfonamide in 80 ml of tetrahydrofuran, was dropwise added at room temperature. After completion of the dropwise addition, the mixture was reacted for further 3 hours. After completion of the reaction, sodium chloride was added until the tetrahydrofuran layer was separated. The separated tetrahydrofuran layer was dried, and tetrahydrofuran was distilled off under reduced pressure to obtain 4.2 g of N-(3-amino-5-trifluoromethyl-2-pyridyl)ethanesulfonamide.
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