S(S([O-])=O)([O-])=O.[Na+].[Na+].[F:9][C:10]1[CH:11]=[CH:12][C:13]([N+:28]([O-])=O)=[C:14]([CH:27]=1)[NH:15][C:16]1[S:20][C:19]2[CH:21]=[CH:22][CH:23]=[CH:24][C:18]=2[C:17]=1[C:25]#[N:26].O>CN(C)C=O>[NH2:28][C:13]1[CH:12]=[CH:11][C:10]([F:9])=[CH:27][C:14]=1[NH:15][C:16]1[S:20][C:19]2[CH:21]=[CH:22][CH:23]=[CH:24][C:18]=2[C:17]=1[C:25]#[N:26]Sodium hydrosulfite (86%, 233 g) was suspended in dimethylformamide (240 ml) and the suspension was heated to 110° C. To this suspension was added dropwise at 110° C. a solution of 2-(5-fluoro-2-nitroanilino)benzo[b]thiophene-3-carbonitrile (120 g), dimethylformamide (720 ml) and water (27.5 ml), which solution had been heated to 65-70° C. The reaction mixture was stirred at 110° C. for 1 hour and cooled to 20° C. Water (3.3 L) was added in 6 portions over 1 hour and the mixture was stirred at 20° C. for 1.5 hours. The precipitated crystals were filtered by suction and washed with water (2 L) to give 2-(2-amino-5-fluoroanilino)benzo[b]thiophene-3-carbonitrile (158 g, (wet weight)) as ocher crystals.
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