Diisopropylethylamine → 2-[4-chloro-5-methyl-3-(trifluoromethyl)pyrazol-1-yl]-N-[1-(4-fluorophenyl)-5-isopropylpyrazol-4-yl]butanamide

Participants

Reaction Steps

To a solution of 1-(4-fluorophenyl)-5-isopropylpyrazol-4-amine (0.03 g, 0.14 mmol) in DMF (1.0 mL) was added 2-[4-chloro-5-methyl-3-(trifluoromethyl)pyrazol-1-yl]butanoic acid (0.037 g, 0.14 mmol), followed by diisopropylethylamine (0.042 g, 0.32 mmol) and HATU (0.057 g, 0.15 mmol). After stirring at room temperature for 1 h, the reaction was diluted with water and the aqueous layer was extracted with ethyl acetate (2×5 mL). The combined organic layers were washed with brine, dried (Na2SO4), filtered, and concentrated in vacuo. The resulting crude product was purified by reverse phase HPLC (C18 column, acetonitrile-H2O with 0.1% TFA as eluent) to give the title compound as a white solid (0.020 g, 0.042 mmol, 31%). 1H NMR (400 MHz, CDCl3) δ 8.47 (s, 1H), 8.04 (s, 1H), 7.35-7.24 (m, 2H), 7.21-7.11 (m, 2H), 4.80 (dd, J=8.7, 6.5 Hz, 1H), 2.98 (m, 1H), 2.42-2.29 (m, 5H), 1.26 (d, J=7.2 Hz, 3H), 1.10 (d, J=7.1 Hz, 3H), 0.92 (t, J=7.3 Hz, 3H); MS: (ES) m/z calculated for C21H22ClF4N5O [M+H]+ 472.1, found 471.9.

Provenance & Evidence