Cesium carbonate → 1-[(2-Ethylphenyl)carbamothioyl]-3-[[4-[1-[4-(trifluoromethoxy)phenyl]-1,2,4-triazol-3-yl]phenyl]methyl]urea

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A fine suspension of (4-(1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazol-3-yl)phenyl)methanamine (C16) (0.300 g, 0.897 mmol) in dichloromethane (4.0 mL) was added, in a slow dropwise fashion, to a biphasic solution of bis(trichloromethyl) carbonate (0.107 g, 0.359 mmol) and sodium acetate (0.221 g, 2.69 mmol) in dichloromethane (4.0 mL) and water (2.0 mL). The reaction was allowed to stir for 30 minutes. The reaction was passed through a phase separator, washing with additional dichloromethane and the organic layer was concentrated. The resulting residue was diluted with acetonitrile (4.0 mL), and 1-(2-ethylphenyl)thiourea (0.178 g, 0.987 mmol) and cesium carbonate (0.351 g, 1.08 mmol) were added as solids. The reaction was allowed to stir at room temperature overnight. The reaction mixture was diluted with dichloromethane and water and passed through a phase separator. The organic layer was concentrated on to Celite® and purified by reverse phase flash column chromatography (C18) using 20-100% acetonitrile/water as eluent providing the title compound as a white solid (0.100 g, 16%) contaminated with ˜20% of the dimer urea: 1H NMR (400 MHz, DMSO-d6) δ 11.99 (s, 1H), 10.24 (s, 1H), 9.41 (s, 1H), 9.40 (d, J=1.0 Hz, 1H), 8.18-8.03 (m, 6H), 7.63 (dddd, J=9.2, 4.3, 2.0, 1.0 Hz, 3H), 7.54 (ddd, J=12.1, 7.0, 4.8 Hz, 2H), 7.50-7.38 (m, 3H), 7.35-7.26 (m, 1H), 7.26-7.20 (m, 2H), 4.44 (d, J=5.8 Hz, 2H), 2.56 (q, J=7.6 Hz, 2H), 1.14 (t, J=7.6 Hz, 3H); 19F NMR (376 MHz, DMSO-d6) δ −56.96; ESIMS m/z 541 ([M+H]+), 539 ([M−H]−)

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