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

Participants

Reaction Steps

A solution of 3-nitro-6-(2-trifluoromethyl-phenyl)-pyridin-2-ylamine (200 mg, 0.706 mmol, prepared as described in Example 22, STEP B) in THF (15 mL) was treated with NaH (84.7 mg, 2.12 mmol) at room temperature for 1 h. The resulting mixture was treated with a solution of 5-tert-butyl-2-methyl-2H-pyrazole-3-carbonyl chloride (156 mg, 0.777 mmol) as a solution in THF (6 mL) and allowed to stir at room temperature for 15 min. The mixture was quenched with saturated aqueous NH4Cl (25 mL) and extracted twice with EtOAc (35 mL). The combined extracts were dried over MgSO4 and concentrated in vacuo. The residue was purified on a 24-g SEPRA Si 50 SPE column (Isco system: Flow rate=20 mL/min; Eluent=EtOAc/hexanes, 1:99 v/v for 5 min, then 1:99 to 1:9 v/v over 40 min) to yield 5-tert-butyl-2-methyl-2H-pyrazole-3-carboxylic acid (5-tert-butyl-2-methyl-2H-pyrazole-3-carbonyl)-[3-nitro-6-(2-trifluoromethyl-phenyl)-pyridin-2-yl]-amide as a yellow solid. Mass Spectrum (LCMS, APCI pos.): Calculated for C30H32F3N7O4: 612.3 (M+H); Measured: 612.1.

Provenance & Evidence