[N+:1]([C:4]1[CH:12]=[CH:11][CH:10]=[CH:9][C:5]=1[C:6]([NH2:8])=[O:7])([O-:3])=[O:2].CO[CH:15](OC)[N:16]([CH3:18])[CH3:17]>>[CH3:15][N:16]([CH:18]=[N:8][C:6](=[O:7])[C:5]1[CH:9]=[CH:10][CH:11]=[CH:12][C:4]=1[N+:1]([O-:3])=[O:2])[CH3:17]2-Nitrobenzamide (2.5 g, 15 mmol) was dissolved in dimethylformamide-dimethylacetal (10 mL) and heated to 100° C. for 1 hour. Upon cooling, the reaction mixture was placed in a freezer at −23° C. overnight. The white precipitate was collected by filtration and rinsed with hexane to provide N-[(dimethylamino)methylene]-2-nitrobenzamide (3.06 g), which was used without further purification.
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