3939-09-1, name is 2,4-Difluorobenzonitrile, belongs to nitriles-buliding-blocks compound, is considered to be a conventional heterocyclic compound, which is widely used in drug synthesis. The chemical synthesis route is as follows. Product Details of 3939-09-1
A solution of 2,4-difluorobenzonitrile (7.07 g, 50.8 mmol) and 3-methyl-1H-1,2,4-triazole (4.22 g, 50.8 mmol) in N,N-dimethylformamide (45 ml) was treated with powdered anhydrous potassium carbonate (10 g) and the resulting mixture was stirred at 22 C. for 18 h. The solid was then filtered and the filtrate was concentrated in vacuo. The residue was diluted with ethyl acetate, washed with water and brine, dried over anhydrous magnesium sulfate and concentrated. The mixture containing the 2 and 4-triazolyl-benzonitriles was purified by a combination of chromatography on silica gel (elution gradient of ethyl acetate in hexane) and on reversed phase silica gel to give 1.86 g (18% yield) of Intermediate 5 and 0.526 g (5% yield) of Intermediate 6. Intermediate 5 4-Fluoro-2-(3-methyl-1H-1,2,4-triazol-1-yl)benzonitrile: White crystals (ethyl acetate/hexanes); mp 117-118 C. 1H NMR (400 MHz, CDCl3) delta: 8.82 (1H, s), 7.84 (1H, dd, J=5.6, 8.6 Hz), 7.62 (1H, dd, J=2.5, 9.1 Hz), 7.24 (1H, m), 2.54 (3H, s). Anal. Calcd for C10H7FN4: C, 59.40; H, 3.49; N, 27.71. found: C, 59.25; H, 3.32; N, 27.81. Intermediate 6 4-fluoro-2-(5-methyl-1H-1,2,4-triazol-1-yl)benzonitrile: White crystals (ethyl acetate-hexane); mp 120-121 C. 1H NMR (400 MHz, CDCl3) delta: 8.06 (1H, s), 7.91 (1H, dd, J=5.5, 8.6 Hz), 7.39 (1H, m), 7.30 (1H, dd, J=2.5, 8.1 Hz), 2.56 (3H, s). Anal. Calcd for C10H7FN4: C, 59.4; H, 3.49; N, 27.71. found: C, 59.35; H, 3.70; N, 27.77.
The synthetic route of 3939-09-1 has been constantly updated, and we look forward to future research findings.
Reference:
Patent; Bristol-Myers Squibb Company; US2007/112190; (2007); A1;,
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts