Triethylamine → 3-(4-(1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazol-3-yl)phenyl)butanoyl azide

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Reaction Steps

To 3-(4-(1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazol-3-yl)phenyl)butanoic acid (C41) (1.77 g, 4.52 mmol) in toluene (18 mL) was added triethylamine (0.82 mL, 5.88 mol) and diphenyl phosphorazidate (1.05 mL, 4.98 mmol) and the solution was stirred at room temperature for 3 hours. The reaction was diluted with ethyl acetate and washed with water. The aqueous layer was extracted with ethyl acetate. The organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated. The crude material was loaded onto a Celite® cartridge and purified by flash column chromatography using 0-100% ethyl acetate/B, where B=1:1 dichloromethane/hexanes, as eluent to afford the title compound as a clear oil (0.223 g, 12% yield): 1H NMR is consistent with a mixture of carbonyl azide and isocyanate. 1H NMR (400 MHz, CDCl3) δ 8.56 (s, 1H), 8.28-8.03 (m, 2H), 7.88-7.66 (m, 2H), 7.48-7.30 (m, 4H), 3.60-3.40 (m, 2H), 3.08 (q, J=6.9 Hz, 1H), 2.81-2.49 (m, 1H), 1.37 (dd, J=10.4, 7.0 Hz, 3H); 19F NMR (376 MHz, CDCl3) δ −58.03; ESIMS m/z 417 ([M+H]+)

Provenance & Evidence