Potassium Hydroxide → 4-[1-(4-pentafluoroethyloxy-phenyl)-1H-[1,2,4]triazol-3-yl]-benzaldehyde

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Reaction Steps

The product from Step 1 (7.0 g, 18.7 mmol) was dissolved in acetonitrile (200 mL) and stirred at ambient temperature while ceric ammonium nitrate (32 g, 58 mmol) in H2O (60 mL) was added in portions over 10 min. The solution was then heated to reflux for 4 h, cooled, and diluted with H2O (200 mL). The solution was extracted with ether (2×200 mL), and the combined organic layer was dried and concentrated to give an orange oil. This material was dissolved in dioxane (40 mL) and treated with a solution of potassium hydroxide (KOH; 5 g, 90 mmol) in H2O (20 mL). The solution was heated to reflux for 2 h, then cooled and diluted with H2O (100 mL). The aldehyde precipitated and was collected by filtration. Recrystallization from MeOH/H2O gave the pure aldehyde as a white solid (2.2 g, 30%): mp 137-144° C.; 1H NMR (300 MHz, CDCl3) δ 10.1 (s, 1H), 8.65 (s, 1H), 8.40 (d, J=8.4 Hz, 2H), 8.0 (d, J=8.4 Hz, 2H), 7.85 (d, J=9 Hz, 2H), 7.45 (d, J=9 Hz, 2H); ESIMS m/z 384.2 (M+H).

Provenance & Evidence