3-(Trifluoromethyl)aniline → N'-hydroxy-4-[(2-methoxyethyl)amino]-N-[3-(trifluoromethyl)phenyl]-1,2,5-oxadiazole-3-carboximidamide

Participants

Reaction Conditions

Reaction Steps

N-Hydroxy-4-[(2-methoxyethyl)amino]-1,2,5-oxadiazole-3-carboximidoyl chloride (1.3 g, 5.0 mmol) [made according to Example 1, steps A through E] was stirred in water (10 mL) and warmed to 60° C. for 5 minutes. 3-(trifluoromethyl)aniline [Aldrich, product # A41801] (880 mg, 5.5 mmol) was added in one portion and the reaction stirred for 15 minutes. While remaining at 60° C., a solution of sodium bicarbonate (630 mg, 7.5 mmol) in water (10 mL) was added dropwise over 5 minutes. The reaction was stirred at 60° C. for an additional 50 minutes, and then allowed to cool to room temperature. Ethyl acetate (20 mL) and brine (30 mL) were added to the flask and the organic layer was collected. The aqueous layer was extracted with ethyl acetate (2×20 mL) and the combined organics were dried over sodium sulfate. The solvent was removed in vacuo to give the desired product as an orange solid (1.4 g, 80%). LCMS calculated for C13H15F3N5O3 (M+H)+: m/z=346.1. 1H NMR (400 MHz, CD3OD): δ 7.36 (t, J=8.2 Hz, 1H), 7.23 (d, J=7.6 Hz, 1H), 7.09 (s, 1H), 7.02 (d, J=8.2 Hz, 1H), 3.60 (t, J=5.2 Hz, 2H), 3.46 (t, J=5.2 Hz, 2H), 3.38 (s, 3H).

Provenance & Evidence