Diisopropylethylamine → 1-(2-(3,3-dimethylbutyl)-4-(trifluoromethyl)benzyl)-3-(1H-indazol-4-yl)urea

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Reaction Steps

To the product of Example 1B dissolved in DMF (80 mL) was added diisopropylethylamine (5.6 mL, 32.1 mmol, 1.2 eq), followed by the addition of the product of Example 1C (8.82 g, 26.5 mmol, 1 eq). The mixture was stirred for 1 hour, diluted with ethyl acetate (600 mL) and the resulting solution washed sequentially with H2O (1×250 mL) and saturated aqueous NH4Cl (1×250 mL), dried (Na2SO4), filtered, and concentrated under reduced pressure. The residue was taked up in 2:1 methanol:THF (90 mL) and 1 N NaOH (30 mL) was added. The solution was stirred 45 minutes, concentrated under reduced pressure to remove the organic solvents. The residue was diluted with ethyl acetate (600 mL), washed sequentially with H2O (2×200 mL), brine (1×200 mL), dried (Na2SO4), filtered and concentrated under reduced pressure. The crude solid was filtered through SiO2 (80 mL) with 4% ethanol in ethyl acetate, stirred over charcoal, filtered and concentrated under reduced pressure, triturated with 4:1 hexane and ethyl ether (150 mL). The solid was recrystallized from methanol and water, filtered and dried under reduced pressure to provide the title compound. 1H-NMR (DMSO-d6) δ 12.99 (brs, 1H), 8.79 (brs, 1H), 8.08 (s, 1H), 7.61 (d, 1H), 7.50-7.59 (m, 3H), 7.20 (t, 1H), 7.02 (d, 1H), 6.81 (t, 1H), 4.45 (d, 2H), 2.70 (ddd, 2H), 1.45 (ddd, 2H), 0.97 (s, 9H).

Provenance & Evidence