Trifluoroacetic acid → 1-(4-(3-Amino-4-cyanoisothiazol-5-yl)phenyl)-3-(2-fluoro-5-methylphenyl)urea

Participants

Reaction Steps

A suspension of 1-(4-{4-cyano-3-[(2,4-dimethoxybenzyl)amino]isothiazol-5-yl}phenyl)-3-(2-fluoro-5-methylphenyl)urea (593 mg, 1.15 mmol) in 50 mL of CH2Cl2 was treated with 1.5 mL of trifluoroacetic acid. Solid was dissolved and the reaction turned to yellow and then red in color. TLC indicated the completion of the reaction in <30 min. Saturated Na2CO3 solution was added and the mixture was stirred for 30 min. Layers were separated and the aqueous layer was extracted with CH2Cl2 (3×). The combined organic extracts were washed with brine and dried with MgSO4, filtered, and concentrated. The crude product was redissolved in 100 mL of EtOAc. Insoluble impurity was filtered through celite and washed with EtOAc. Filtrate was concentrated in vacuo to afford the title compound as a cream solid (398 mg, 94%).

Provenance & Evidence