Tert-butyl acetoacetate → 3-oxo-N-(4-(1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazol-3-yl)phenyl)-butanamide

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A solution of 4-(1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazol-3-yl)aniline (1.0 g, 3.12 mmol) and t-butyl acetoacetate (0.494 g, 3.12 mmol) in 8 mL of toluene was heated at 90° C. for 2 h, then cooled. The resulting solid was filtered and air-dried to give 1.12 g (89%) of 3-oxo-N-(4-(1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazol-3-yl)phenyl)-butanamide as a tan solid (B10); mp 159-164° C. 1H NMR (CDCl3) δ 9.35 (s, 1H), 8.55 (s, 1H), 8.19-8.09 (d, J=8.7 Hz, 2H), 7.83-7.74 (d, J=9.1 Hz, 2H), 7.74-7.63 (d, J=8.7 Hz, 2H), 7.43-7.32 (d, J=8.3 Hz, 2H), 3.62 (s, 2H), 2.34 (s, 3H); 13C NMR (101 MHz, CDCl3) δ 205.34, 163.43, 163.02, 148.34, 141.49, 138.84, 135.55, 127.37, 126.50, 122.37, 121.67, 121.16, 120.03, 49.56, 31.36; ESIMS m/z 581 ([M+H]+).

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