Triethylamine → 2-{4-[1-(4-trifluoromethoxyphenyl)-1H-[1,2,4]triazol-3-yl]phenyl}cyclopropanecarbonyl azide

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Reaction Steps

To 2-(4-(1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazol-3-yl)phenyl)-cyclopropanecarboxylic acid (C20) (2.49 g, 6.40 mmol) in toluene (30 mL) was added triethylamine (2.20 mL, 16.0 mmol), followed by diphenyl phosphorazidate (1.70 mL, 8.00 mmol). The yellow solution was stirred overnight at room temperature. The reaction was quenched with water and saturated aqueous sodium bicarbonate, extracted with 1:1 ethyl acetate/hexanes (2×), dried over anhydrous sodium sulfate, and filtered. The crude compound was adsorbed onto silica gel and purified by flash column chromatography using 0-100% ethyl acetate/hexanes as eluent to afford the title compound as a yellow oil (1.94 g, 73%): 1H NMR (400 MHz, CDCl3) δ 8.56 (s, 1H), 8.16-8.03 (m, 2H), 7.83-7.72 (m, 2H), 7.44-7.34 (m, 2H), 7.20 (d, J=8.2 Hz, 2H), 2.70 (ddd, J=9.3, 6.8, 4.1 Hz, 1H), 1.98 (ddd, J=8.4, 5.3, 4.1 Hz, 1H), 1.78 (dt, J=9.4, 5.0 Hz, 1H), 1.53 (ddd, J=8.3, 6.8, 4.7 Hz, 1H); 19F NMR (376 MHz, CDCl3) δ −58.03.

Provenance & Evidence