Sodium hydride → 5-tert-butyl-4-chloro-2-methyl-2H-pyrazole-3-carboxylic acid [2-[2-(tert-butyl-dimethyl-silanyloxy)-ethoxy]-3-nitro-6-(2-trifluoromethyl-phenyl)-pyridin-4-yl]-amide

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Reaction Steps

To a mixture of 60% sodium hydride in mineral oil (120 mg, 3.00 mmol) in THF (10 mL) at 0° C. was added 2-[2-(tert-butyl-dimethyl-silanyloxy)-ethoxy]-3-nitro-6-(2-trifluoromethyl-phenyl)-pyridin-4-ylamine (458 mg, 1.00 mmol, prepared as described in the previous step) slowly. The resulting mixture was warmed to room temperature and then stirred for 1 h under Ar. 5-tert-Butyl-4-chloro-2-methyl-2H-pyrazole-3-carbonyl chloride (259 mg, 1.10 mmol, prepared as described in Example 1, STEP C) was added and the resulting mixture was stirred for 3 h under Ar. After quenching with saturated aqueous NH4CI solution (5 mL), the mixture was treated with EtOAc (100 mL) and washed with H2O, brine and dried with Na2SO4. Removal of the solvent under reduced pressure followed by flash chromatography of the residue on silica gel (0:100-10:90 EtOAc/hexanes) yielded 5-tert-butyl-4-chloro-2-methyl-2H-pyrazole-3-carboxylic acid [2-[2-(tert-butyl-dimethyl-silanyloxy)-ethoxy]-3-nitro-6-(2-trifluoromethyl-phenyl)-pyridin-4-yl]-amide as a white solid. 1H-NMR (400 MHz, CD3OD) δ: 10.10 (s, 1H), 8.33 (s, 1H), 7.81 (d, J=7.6 Hz, 1H), 7.62-7.70 (m, 1H), 7.52-7.62 (m, 2H), 4.51-4.61 (m, 2H), 4.11 (s, 3H), 3.94-4.01 (m, 2H), 1.42 (s, 9H), 0.89 (s, 9H), 0.07 (s, 6H). Mass Spectrum (LCMS, ESI pos.) Calculated For C29H37ClF3N5O5Si: 656.2 (M+H). Measured: 656.2.

Provenance & Evidence