Ammonia → 1-(4-(3,5-dimethyl-1H-1,2,4-triazol-1-yl)-3-fluorophenyl)thiourea

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Reaction Steps

Step T (3): Dichloromethane (100 mL) was added to a flask charged with 4-(3,5-dimethyl-1H-1,2,4-triazol-1-yl)-3-fluoroaniline (1.67 g, 8.10 mmol and 1,1′-thiocarbonyldipyridin-2(1H)-one (1.88 g, 8.10 mmol). The resulting mixture was stirred for 24 h at rt and concentrated in vacuo. A solution of ammonia (2.0 M in methanol, 50 mL, 100 mmol) was added to the crude solid. The heterogeneous mixture was stirred at rt for 2 h, then evaporated to dryness under reduced pressure using a rotory evaporator. The solid residue was triturated with anhydrous ethanol and chilled to 0° C. for 1 h. The solid was collected by vacuum filtration and dried under high vacuum to afford 1-(4-(3,5-dimethyl-1H-1,2,4-triazol-1-yl)-3-fluorophenyl)thiourea (1.10 g, 4.06 mmol, 50% yield) as a white powdery solid. LC-MS (M+H)+ 266.3. 1H NMR (500 MHz, DMSO-d6) δ ppm 10.06 (s, 1 H), 7.91 (d, J=12.5 Hz, 1 H), 7.50 (t, J=8.5 Hz, 1 H), 7.35 (d, J=8.9 Hz, 1 H), 2.26 (s, 6 H).

Provenance & Evidence