[C:1]([C:3]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[N:5]([C:12]2[CH:20]=[CH:19][C:15]([C:16]([OH:18])=[O:17])=[C:14]([N+:21]([O-])=O)[CH:13]=2)[CH:4]=1)#[N:2].C(O)C.O.[Cl-].[NH4+]>[Zn].C(OCC)(=O)C.O1CCCC1>[NH2:21][C:14]1[CH:13]=[C:12]([N:5]2[C:6]3[C:11](=[CH:10][CH:9]=[CH:8][CH:7]=3)[C:3]([C:1]#[N:2])=[CH:4]2)[CH:20]=[CH:19][C:15]=1[C:16]([OH:18])=[O:17]To a solution of 4-(3-cyanoindol-1-yl)-2-nitrobenzoic acid (0.012 g) in a mixed solvent of ethanol (1 mL), water (0.5 mL) and tetrahydrofuran (0.5 mL) were added zinc powder (0.041 g) and ammonium chloride (0.004 g) at room temperature, and this mixture was stirred at 80° C. for 2.5 hours. After cooling to ambient temperature, to this reaction mixture was added ethyl acetate. This insoluble material was removed by filtration and this filtrate was washed with brine, dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure to give the title compound (0.003 g).
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