4-Fluorophenyl isocyanate → 1-[3-(4-Fluoro-2-methyl-2H-pyrazol-3-yl)-4-methoxy-phenyl]-3-(4-fluoro-phenyl)-urea

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Reaction Steps

3-(4-Fluoro-2-methyl-2H-pyrazol-3-yl)-4-methoxy-phenylamine (45 mg, 0.20 mmol) was dissolved in 3 mL of CH2Cl2, treated with 4-fluorophenylisocyanate (28 μL, 0.24 mmol), and stirred at room temperature overnight. The compound of interest precipitated out of solution and was filtered and washed with CH2Cl2 to afford Compound 31 as a white solid, 56 mg, 77% yield: LCMS m/z (%)=359 (M+H, 100). 1H NMR (400 MHz, acetone-d6) δ: 8.12 (s, 1H), 8.08 (s, 1H), 7.63 (ddd, J1=9.0 Hz, J2=2.6 Hz, 1H), 7.54 (m, 2H), 7.48 (d, J=2.8 Hz, 1H), 7.38 (d, JH,F=4.8 Hz, 1H), 7.13 (d, J=8.8 Hz, 1H), 7.05 (dd, J1=9.0 Hz, J2=9.0 Hz, 2H), 3.83 (s, 3H), 3.65 (s, 3H). 19F NMR (376 MHz, acetone-d6) δ: −123.08 (m, 1F), −177.41 (d, JH,F=5.3 Hz, 1F).

Provenance & Evidence