1,2-Dichloro-3-isocyanatobenzene → ethyl 4-{3-t-butyl-5-[3-(2,3-dichlorophenyl)-ureido]-1H-pyrazol-1-yl}benzoate

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Using General method A, ethyl 4-(3-t-butyl-5-amino-1H-pyrazol-1-yl)benzoate (1 g, 3.09 mmol, prepared from ethyl 4-hydrazinobenzoate and pivaloylacetonitrile by the procedure of Regan, et al., J. Med. Chem., 45, 2994 (2002)) and 1,2-dichloro-3-isocyanato-benzene (0.7 g, 3.71 mmol) were combined to afford ethyl 4-{3-t-butyl-5-[3-(2,3-dichlorophenyl)-ureido]-1H-pyrazol-1-yl}benzoate (0.7 g, 48% yield). 1H NMR (300 MHz, DMSO-d6): δ 9.20 (brs, 1H), 8.77 (brs, 1H), 8.04 (m, 1H), 7.44 (brs, 4H), 7.29-7.26 (m, 2H), 6.36 (s, 1H), 4.31 (q, J=7.2 Hz, 2H), 1.27 (s, 9H), 1.26 (t, J=7.2 Hz, 3H).

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