[NH2:1][C:2]1[CH:9]=[CH:8][C:7]([N+:10]([O-:12])=[O:11])=[CH:6][C:3]=1[C:4]#[N:5].CO[CH:15](OC)[N:16]([CH3:18])[CH3:17]>>[C:4]([C:3]1[CH:6]=[C:7]([N+:10]([O-:12])=[O:11])[CH:8]=[CH:9][C:2]=1[N:1]=[CH:15][N:16]([CH3:18])[CH3:17])#[N:5]A mixture of 2-amino-5-nitrobenzonitrile (30.0 g, 184 mmol) and dimethoxy-N,N-dimethylmethanamine (29.6 mL, 223 mmol) was heated to 100° C. for 2 hours. The reaction mixture was concentrated under reduced pressure and dissolved in dichloromethane. The solution was run through a silica plug washing the plug with ethyl acetate. The filtrate was concentrated under reduced pressure, stirred with ether and filtered to provide the product (35.0 g, 87%) as yellow solid.
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