[F:1][C:2]1[CH:9]=[C:8]([NH:10][C:11]2[C:16]([N+:17]([O-])=O)=[CH:15][CH:14]=[CH:13][N:12]=2)[CH:7]=[CH:6][C:3]=1[C:4]#[N:5].O1CCCC1.[Cl-].[NH4+]>[Zn].O>[NH2:17][C:16]1[C:11]([NH:10][C:8]2[CH:7]=[CH:6][C:3]([C:4]#[N:5])=[C:2]([F:1])[CH:9]=2)=[N:12][CH:13]=[CH:14][CH:15]=1To a solution of 2-fluoro-4-[(3-nitropyridin-2-yl)amino]benzonitrile (C14) (5.4 g, 21 mmol) in a 1:1 mixture of tetrahydrofuran and water (40 mL) was added ammonium chloride (8.9 g, 170 mmol), followed by zinc (10.8 g, 165 mmol). The mixture was stirred at 60° C. for 30 minutes, whereupon it was filtered through a pad of Celite. The organic layer from the filtrate was diluted with ethyl acetate, washed with saturated aqueous ammonium chloride solution, dried over sodium sulfate, filtered, and concentrated in vacuo; the residue was washed with heptane to afford the product as a brown solid. Yield: 4.2 g, 18 mmol, 86%. LCMS m/z 229.1 [M+H]+. 1H NMR (400 MHz, DMSO-d6) δ 8.68 (br s, 1H), 7.82 (dd, J=13.6, 2.0 Hz, 1H), 7.66 (dd, J=8.4, 8.3 Hz, 1H), 7.61 (dd, J=4.8, 1.6 Hz, 1H), 7.37 (dd, J=8.8, 2.0 Hz, 1H), 7.03 (dd, J=7.8, 1.6 Hz, 1H), 6.82 (dd, J=7.8, 4.8 Hz, 1H), 5.24 (br s, 2H).
Wird geladen…
