Researchers who often do experiments know that organic synthesis is a process of preparing more complex target molecules from simple raw materials through one or more chemical reactions. Generally, it requires fewer steps, and cheap raw materials. 21524-39-0, name is 2,3-Difluorobenzonitrile, A new synthetic method of this compound is introduced below., 21524-39-0
Intermediate 52: 3-Fluoro-2-(2H-1 ,2,3-triazol-2-yl)benzoic acid.Step A: 3-Fluoro-2-(2H-1 ,2,3-triazol-2-yl)benzonitrile and 3-fluoro-2-(1 H- 1 ,2,3-triazol-1 -yl)benzonitrile. A mixture of 2,3-difluorobenzonitrile (4.0 g, 28.8 mmol), 2H-1 ,2,3-triazole (1 .9 g, 28.8 mmol) in DMF (85.0 mL) and K2C03 (7.9 g, 57.5 mmol) were heated to 125 C for 1 .5 h. After cooling to rt, water was added and the mixture extracted with EtOAc (2 X). The combined organics were washed with brine and dried (Na2S04). Purification via FCC (10-100% EtOAc in hexanes) gave two products. 3-Fluoro-2-(2H-1 ,2,3-triazol-2- yl)benzonitrile (1 .6 g, 29%), 1H NMR (CDCI3): 7.99 (s, J = 6.6 Hz, 2H), 7.67 – 7.63 (m, 1 H), 7.61 – 7.53 (m, 2H), 7.26 (s, 6 H) and 3-fluoro-2-(1 H-1 ,2,3-triazol- 1 -yl)benzonitrile (2.0 g, 38%) 1H NMR (CDCI3): 7.97 (dd, J = 4.4, 2.8 Hz, 1 H), 7.95 (d, J = 1 .2 Hz, 1 H), 7.70 (tt, J = 5.7, 2.8 Hz, 1 H), 7.65 (td, J = 8.1 , 4.9 Hz, 1 H), 7.62 – 7.57 (m, 1 H).
The basis of chemical reaction formula synthesis, the synthesis route is composed of some specific reactions and combined according to certain logical thinking. We look forward to the emergence of more reaction modes in the future.
Reference:
Patent; JANSSEN PHARMACEUTICA NV; LETAVIC, Michael; RUDOLPH, Dale, A.; SAVALL, Brad, M.; SHIREMAN, Brock, T.; SWANSON, Devin; WO2012/145581; (2012); A1;,
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