Diisopropylethylamine → 5-bromo-1-(tetrahydro-2H-pyran-2-yl)-N-(6-(trifluoromethyl) pyridin-3-yl)-1H-indazole-3-carboxamide

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Reaction Steps

HATU (1.125 g, 2.96 mmol) was added to a solution of 5-bromo-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole-3-carboxylic acid (CXVIII) (0.876 g, 2.69 mmol) and diisopropylethylamine (1.03 mL, 5.92 mmol) in DMF stirred at room temperature under argon. After stirring 5 min, the solution was added with 5-amino-2-trifluoromethylpyridine (CXXVII) (0.479 g, 2.96 mmol). The solution was stirred 24 h at room temperature under argon. The DMF was removed under reduced pressure, and the residue was treated with water, sonicated briefly and filtered. The solids were washed with cold water and dried at room temperature. The product was purified by silica gel column chromatography (100% hexanes→7:93 EtOAc:hexanes) to afford 5-bromo-1-(tetrahydro-2H-pyran-2-yl)-N-(6-(trifluoromethyl)pyridin-3-yl)-1H-indazole-3-carboxamide (CXXVIII) as a white solid (1.17 g, 2.50 mmol, 93% yield). 1H NMR (DMSO-d6) δ ppm 10.93 (s, 1H), 9.23 (d, J=1.9 Hz, 1H), 8.60 (dd, J=6.8, 1.4 Hz, 1H), 8.38 (d, J=4.4 Hz, 1H), 7.95 (m, 2H), 7.70 (dd, J=7.1, 1.5 Hz, 1H), 6.04 (dd, J=8.1, 1.9 Hz, 1H), 3.98 (m, 1H), 3.82 (m, 1H), 2.59-2.54 (m, 1H), 2.08-2.03 (m, 2H), 1.81-1.77 (m, 1H). 1.66-1.61 (m, 2H); ESIMS found for C19H16BrF3N4O2 m/z 470.0 (M+H).

Provenance & Evidence