1-Isocyanato-4-methoxybenzene → 1-[3-(4-Bromo-2-methyl-2H-pyrazol-3-yl)-4-methoxy-phenyl]-3-(4-methoxy-phenyl)-urea

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3-(4-Bromo-2-methyl-2H-pyrazol-3-yl)-4-methoxy-phenylamine (0.031 g, 0.11 mmol) was treated with 4-methoxyphenyl isocyanate (0.016 g, 14.2 μL, 0.11 mmol, 1.0 equiv.) in CH2Cl2 (2 mL), in a similar manner as described in Example 1.2 to afford Compound 4 (0.037 g, 0.086 mmol, 78%) as a white solid. LCMS m/z (%)=431 (M+H79Br, 89), 433 (M+H81Br, 100). 1H NMR (400 MHz, acetone-d6) δ: 8.02 (s, 1H), 7.89 (s, 1H), 7.67 (dd, J=2.7, 9.0 Hz, 1H), 7.49 (s, 1H), 7.43 (s, 1H), 7.42 (d, J=9.0 Hz, 2H), 7.12 (d, J=9.0 Hz, 1H), 6.85 (d, J=9.0 Hz, 2H), 3.81 (s, 3H), 3.75 (s, 3H), 3.68 (s, 3H).

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