[CH3:1][N:2]([CH3:24])[C:3](=[O:23])[C:4]1[CH:9]=[CH:8][C:7]([N:10]2[CH:14]=[CH:13][N:12]=[C:11]2[C:15]2[CH:19]=[CH:18][S:17][CH:16]=2)=[C:6]([N+:20]([O-])=O)[CH:5]=1.C(O)(=O)C.[O-]S([O-])(=S)=O.[Na+].[Na+].N>O1CCCC1.C(OCC)(=O)C.O>[NH2:20][C:6]1[CH:5]=[C:4]([CH:9]=[CH:8][C:7]=1[N:10]1[CH:14]=[CH:13][N:12]=[C:11]1[C:15]1[CH:19]=[CH:18][S:17][CH:16]=1)[C:3]([N:2]([CH3:24])[CH3:1])=[O:23]To 1.60 g of N,N-dimethyl-3-nitro-4-[2-(3-thienyl)-1H-imidazol-1-yl]benzamide, 5.8 mL of acetic acid and 5.8 mL of water were added, and dissolved under heating. To the solution 3.25 g of 85% sodium hyposulfite was added little by little, followed by 3.3 hours' heating under reflux. The reaction liquid was cooled with ice, to which ethyl acetate was added, and then 25% aqueous ammonia was added little by little to render the same weakly alkaline. Tetrahydrofuran was added and whereby separated organic layer was recovered, which was washed with brine and dried over magnesium sulfate. Distilling the solvent off, 769 mg of the title compound was obtained.
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