Synthesis
The general procedure for the synthesis of 5-fluoro-2-methylbenzonitrile from the compound (CAS: 953422-44-1) was as follows: aldoxime (1 mmol) and imidazole (3 mmol) were dissolved in anhydrous dichloromethane (10-15 mL) under nitrogen protection, added to a pre-oven-dried round-bottomed flask, and the reaction mixture was stirred at room temperature.After 20 min, the reaction mixture was stirred via syringe under After 20 min, trifluoromethanesulfonic anhydride (0.4-1.0 mmol) was slowly added dropwise via syringe under nitrogen protection and the reaction mixture was continued to be stirred at room temperature for a specific time (see Table 1). The reaction process was monitored by thin layer chromatography (TLC) and/or gas chromatography-mass spectrometry (GC-MS). Upon completion of the reaction, the reaction was quenched with dilute sodium bicarbonate (NaHCO3) solution and the product was extracted with dichloromethane. The solvent was removed by concentration under reduced pressure to give the crude product, which was subsequently purified by preparative thin-layer chromatography (TLC) using a solvent mixture of ethyl acetate-hexane (80:20) to give the target nitrile analogs in 61-88% yield. The structure of the products was confirmed by melting point (mp) or boiling point (bp), TLC, infrared spectroscopy (IR), GC-MS, 1H nuclear magnetic resonance (NMR), and 13C NMR data in comparison with authentic samples commercially purchased or prepared by literature methods.
References
[1] Tetrahedron Letters, 2011, vol. 52, # 40, p. 5184 - 5187
